A work has recently been republished in this country entitled, "A Treatise on Food and Diet ; by Dr. J. Pereira. Edited by Dr. Charles A. Lee." "The author of this work," says Dr. Lee, "is well known throughout Europe and America, as one of the most learned, scientific, and practical men of the age ;- a physician of great experience and accurate observation, and a highly successful writer. To the medical profession he is most favorably known as the author of the best work on the Materia Medica which has appeared in our language."

This work contains the principles discovered by Leibig, Dûmas, and Brossingault, and applies them practically to the subject of the proper selection of food. All the opinions, expressed in what follows, are sanctioned by the above work, by Dr. Combe, and by most of the distinguished practitioners of our age and country.

In selecting food, with reference to health, the following principles must be borne in mind.

First, that there are general rules in regard to healthful food and drink, which have been established, not by a few, but by thousands and thousands of experiments, through many ages, and in an immense variety of circumstances. It is these great principles, which mustbe the main dependance of every mother and housekeeper, to guide her in selecting healthful food and drink for her children and family. These rules are furnished by medical writers and practitioners.

Secondly, there are occasional exceptions to these general rules, and when such occur, two errors should be avoided. One is, giving up all confidence in the deductions of a wide experience, established by extensive experiments, and assuming that we have no rules at all and that every person must follow the guidance of mere appetite, or his own limited experience. The other is making the exception into a general rule, and maintaining that every person must conform to it.

For example, it is found by general experience, that milk is a very safe and healthful article of food, and that alcoholic drinks are very unhealthful. But there are cases which seem to be exceptions to this rule ; for some children never can eat milk without being made sick and there are cases known where men have lived to a very advanced age and in perfect health, who have daily used alcoholic drinks, even to the point of intoxication.

Still, it is very unwise to throw away the general rule and say, that it is just as well for children to drink alcoholic drinks as to use milk, -and as unwise to claim that every person must give up the use of milk because a few are injured by it.

The true method is, to take the general rules obtained by abundant experience for our guide, and when any exceptions are found, to regard them as exceptions which do not vacate the general rule, nor make it needful to conform all other cases to this exception.

It will be the object of what follows, to point out the general rules, which are to regulate in the selection of drinks and diet, leaving it to each individual to ascertain, by experiments, what are, and what are not the exceptions.

In the first place, then, it is a general rule that man needs a variety of ailment, so that it is unfavorable to health to be confined to only one kind of food.

The various textures of the human body are composedof chemical compounds, which differ from each other, both as to ingredients, and as to modes of combination. It is true, that every portion of the body may be resolved to a few simple elements, of which oxygen, hydrogen, carbon, and nitrogen are the chief. But the bodily organs have not the power of forming all the various animal tissues from these simple elements. Instead of this, they must be introduced into the body in various complex and different combinations, as they exist in the forms of gluten, fibrine, albumen, caseine, and other animal and vegetable compounds.

Thus the sugar, starch, and oils, found in certain kinds of food, supply the carbon which sustain the combustion ever carried on in the lungs by the process of breathing, and which is the grand source of animal heat. On the contrary, the blood, muscles, skin, cartilages, and other parts of the body, are daily nourished and renewed, some by the gluten contained in wheat, others by the albumen of eggs, others by the caseine of milk, and others by the fibrine of animals. All these are found in a great variety of articles used as food. When received into the stomach, the organs of digestion and assimilation prepare, and then carry them, each to its own appropriate organ, and then the excreting organs throw off the surplus.

In order, then, to have every portion of the body properly developed, it is necessary to take such a variety of food, that from one source or another, every organ of the body shall be sustained by its appropriate nourishment. The experiments which prove this, have been conducted on a great scale, and the method and results are detailed in the work of Dr. Pereira.

This fact exhibits one cause of the craving, sometimes felt for certain kinds of food, which usually is the call of nature for some ingredient, that the daily round of aliment does not supply. The statistics furnished in the work of Dr. Pereira, from various armies, prisons, alms-houses, and asylums, show, that, where many hundreds are fed on the same diet, the general health of the multitude is better sustained by a considerable variety andoccasional changes, than by a more restricted selection. Experiments on dogs and other animals, also, have been tried on a large scale, which prove that there is no kind of food, which, alone, will preserve full and perfect health ; while every kind (except the food containing gluten, which is the chief ingredient of wheat and other breadstuffs), when given exclusively, eventually destroys life. The exclusive use of wheat bread and potatoes, as found by experiment, will sustain life and health more perfectly, for a great length of time, than any other kinds of food.

The above fact is a striking exhibition of the beneficence of Providence, in providing such an immense variety of articles of food. And no less so is the instinct of appetite, which demands not only a variety, but is wearied with one unchanging round.

Having ascertained that it is needful to health, that a due variety of food should be secured, we next proceed to examine the principles that are to guide us in the selection.

It is found that the articles used for food and drink may be arranged in the following classes:-

First, articles that furnish no other stimulation to the animal functions than is secured by the fresh supply of nutrition. All food that nourishes the body, in one sense, may be called stimulating, inasmuch as it imparts renewed energies to the various bodily functions. In this sense even bread is a stimulant. But the more common idea attached to the word stimulant is, that it is a principle which imparts a speed and energy to the organs of the system above the ordinary point secured by perfect and appropriate nourishment. The first class, then, are those articles that serve to nourish and develop perfectly every animal function, but do not increase the strength and speed of organic action above the point of full nourishment. The bread-stuffs, vegetables, fruits, sugar, salt, acid drinks, and water are of this class.

Secondly, those articles, which serve to nourish perfectly all the animal system, and at the same time increase the strength and speed of all functional action. All animal food is of this class. All physiologists and medical men agree in the fact, that the pulse and all the organs of the body, are not only nourished, but are quickened in action by animal food, while speed and force are reduced by confining the diet to farinaceous, vegetable, and fruit diet.

Thirdly, those articles which impart no nourishment at all to the body, but act solely to stimulate all the organs to preternatural action. Alcoholic drinks, condiments, and aromatic oils are of this description.

Fourthly, articles that are neither nourishing nor stimulating, but pass out of the system entirely undigested and unassimilated. The bran of coarse bread is an example.

Fifthly, articles that, either from their nature or modes of combination and cooking, are difficult of digestion, unhealthful, and, of course, tend to weaken the organic powers by excessive or unnatural action. Animal oils, either cooked or rancid, and many articles badly cooked, are of this kind.

The following presents a list of the articles which are found to be healthful and nourishing, and not stimulating, except as they supply the nourishment needed by the various bodily functions.

The first and most important of these are called the farinaceous substances. Of these, wheat stands at the head, as the most nutritive, safe, and acceptable diet to all classes and in all circumstances. This can be used in the form of bread, every day, through a whole life, without cloying the appetite, and to an extent which can be said of no other food.

Wheat is prepared in several forms, the principal of which are the common Fine Wheat Flour, the Unbolted, or Graham Flour, and Macaroni, Vermicelli, and Cagliari Pastes. The last are flour paste prepared, or cut into various shapes and dried.

Wheat flour is made into bread of two kinds, the fermented,or spongy breads, and the unfermented, or hard breads.

The spongy breads are made by using either yeast, or the combination of an acid and alkali. In yeast bread, the fermentation of the particles of diffused yeast evolve carbonic acid. This expands the flour in a spongy form, in which it is retained by the tenacity of the gluten of the flour, until baking hardens it. Corn meal and some other bread-stuffs cannot be raised thus, because they do not contain gluten sufficient to hold the carbonic acid as it evolves.

When an alkali and acid are used to raise bread, their combination evolves carbonic acid by a more sudden process than the yeast fermentation. The lightness produced by eggs is owing to their adhesive porosity when beaten and mixed with flour and baked.

Bread is also made of rice, rye, Indian meal, and barley. These varieties of bread-stuffs are useful in various ways. In cases when persons are troubled with looseness of bowels, rice bread, rice gruel, and rice water for drink, prevent the necessity of resorting to medicine. In cases where the opposite difficulty exists, a diet of unbolted wheat, or rye mush with salt and molasses will remedy the evil. These articles also can, all of them, be formed into a great variety of combinations that are at once healthful, and acceptable to the palate.

The next class of healthful and unstimulating articles are the amylaceous, or starchy articles of diet. Of these Sago, Tapioca, Arrow Root, and the Lichens, are those in most frequent use. These are nourishing and remarkably easy of digestion. They are very much used for invalids, and for young children when first weaned.

The next most valuable articles of food are the vegetables. Of these the Potato is at once the most healthful, and most universally relished. In the form of Starch, it makes, when cooked, a light and agreeable article for the sick, and is convenient to housekeepers as forming a fine minute pudding to meet an emergency.

Of the great variety of vegetables that are furnished at market, or from our gardens, almost all are palatableand healthful to a stomach that is strong. Peas, Beans, Onions, and cooked Cabbage and Turnips, usually are not good for persons whose powers of digestion have been weakened.

The next most valuable articles of food are the Fruits. Almost all kinds of fruit, when fully ripe, are healthful to those who are not suffering from weakness of digestion. Grapes, Apples, Peaches, Strawberries, Raspberries, and Currants, are least likely to prove injurious. The skins and seeds of all fruits consist of woody matter, that is perfectly undigestible, and should never be taken in large quantities. It is the skins and seeds of the grape that make raisins so often injurious to young children. If the skins and stones can be removed, nothing can be found that is more safe and healthful, in moderate quantities, than raisins and grapes.

The next articles of healthful unstimulating food are the Saccharine substances, Sugar, Molasses, and Honey. On this point, Dr. Pereira remarks, "The injurious effects which have been ascribed to sugar are more imaginary than real. The fondness of children for saccharine substances may be regarded as a natural instinct ; since nature, by placing it in the mother's milk, evidently intended it to form a part of their nourishment. Instead, therefore, of repressing this appetite for sugar, it ought rather to be gratified in moderation. The popular notion, of its having a tendency to injure the teeth, is totally unfounded. During the sugar season of the West Indies, every negro on the plantations, every animal, and even the dogs, grow fat. And no people on earth have finer teeth than the negroes of Jamaica. It is probable that this erroneous notion has been propagated by frugal housewives, in order to deter children from indulging in an expensive luxury. Sugar is readily digested by a healthy stomach. In dyspeptics, it is apt to give rise to flatulence and acidity of stomach."

These remarks, without other considerations, may lead to erroneous conclusions. There is no doubt that both children and adults are often injured by the use of sugar, but it is not because it is unhealthful in its nature, butbecause it is used in excess or in an improper manner. In the "Domestic Economy," pg. 105, it is shown that highly concentrated food is not favorable to digestion, because it cannot be properly acted on by the muscular contractions of the stomach, and is not so minutely divided as to enable the gastric juice to act properly. Now Sugar, Candy, and the like, are highly concentrated nourishment, and should not be used except when mixed with other food. The reason, then, why children are injured by sugar is, that they eat it too frequently, in too large quantities, and unmixed with other food. A stick or two of pure candy, eaten with crackers or bread, never would injure any healthy child. It is too often the case, that candies are mixed with unhealthful coloring matter, or with nuts and other oily substances, that make them injurious.

The next article of healthful, unstimulating food, is jellies and preseved fruits. As it has been shown that uncooked fruits and sugar are both healthful, it may not seem surprising that jellies and fruits cooked in sugar, when eaten moderately, with bread or crackers, are regarded as among the most nourishing and healthful of all aliments. When they prove injurious, it is owing either to the fact that they are taken alone, or with rich cream, or else are taken in too great quantities. Eaten moderately, as a part of a meal, they are safe and nourishing to all, except persons of poor digestion. Healthful stomachs need not be governed by rules demanded by the invalid, which has too often been attempted.

The preceding presents a vast variety of articles suitable for food, containing in abundance all the principles demanded for the perfect development of all the animal functions, and which physiologists and medical men unitedly allow to be healthful. These can be combined by the cook in an endless variety of agreeable dishes, involving no risk to a healthful stomach, when taken in proper quantities and in a proper time and manner.

The articles which come under this head, are usually called the condiments. In regard to these, Dr. Pereira remarks,-

"The relish for flavoring, or seasoning ingredients, manifested by almost every person, would lead us to suppose that these substances serve some useful purpose beyond that of merely gratifying the palate. At present, however, we have no evidence that they do. They stimulate, but do not seem to nourish. The volatile oil they contain is absorbed, and then thrown out of the system, still possessing its characteristic odor."

The articles used for food of this kind, are the sweet herbs employed for seasoning, such as Thyme, Summer Savory, and the like, and the spices, such as Cloves, Cinnamon, Nutmeg, Pepper, and Ginger. Mustard, Horseradish, Water Cresses, Garlic, and Onions, contain these stimulating oils, combined with some nourishing food.

"Condiments," says Dr. Beaumont, "particularly those of a spicy kind, are non-essential to the process of digestion in a healthy state of the system. They afford no nutrition. Though they may assist the action of a debilitate stomach for a time, their continual use never fails to produce an indirect debility of that organ. They affect it as alcohol and other stimulants do- the present relief afforded is at the expense of future suffering. Salt and Vinegar are exceptions when used in moderation. They both assist in digestion, Vinegar by rendering muscular fibre more tender, and both together, by producing a fluid having some analogy to the gastric juice."

There is no kind of food used which consists exclusively of indigestible matter. But it often is the case,that a certain amount of indigestible matter is mixed with nourishing food, and serves, by its mechanical aid, to promote the healthful action of the stomach and bowels. This is the reason why unbolted flour is deemed more healthful than fine flour, and is consequently preferred for dyspeptics. But where there is too great a quantity of such indigestible matter, or where it is not properly combined with digestible food, it proves injurious and often dangerous. This is the case when the skins and seeds of fruits are swallowed, which always pass off entirely undigested.

The most injurious food, of any in common use, is the animal oils, and articles cooked with them. On this subject, Dr. Pereira remarks:-"Fixed oil, or fat, is more difficult of digestion, and more obnoxious to the stomach, than any other alimentary principle. Indeed, in concealed forms, I believe it will be found to be the offending ingredient in nine-tenths of the dishes which disturb weak stomachs. Many dyspeptics who avoid fat meat, butter, and oil, unwittingly eat it in some concealed form. Liver, the yolk of eggs, and brains, such individuals should eschew, as they abound in oily matter."

"The influence of heat on fatty substances effects chemical changes, whereby they are rendered more difficult of digestion, and more obnoxious to the stomach. Hence those culinary operations in which fat or oil is subjected to high temperatures, are objectionable."

"Fixed oils give off, while boiling, carbonic acid, an inflammable vapor, and an acrid oil, called Acroleon, while the fatty acids of the oil are, in part, set free. It has always appeared to me that cooked butter proves more obnoxious to the stomach than cooked Olive oil. This I ascribe to the facility with which, under the influence of heat, the acrid, volatile acids of butter are set free. The fat of salt pork and bacon is less injurious to somedyspeptics than fresh animal fats. This must depend on some change effected by curing."

"In many dyspeptics, fat does not become properly chymified. It floats on the stomach in the form of an oily pellicle, becoming odorous, and sometimes highly rancid, and in this state excites heartburn, disagreeable nausea, eructations, and sometimes vomiting. It appears to me, that the greater tendency which some oily substances have than others to disturb the stomach, depends on the greater facility with which they evolve volatile, fatty acids, which are for the most part exceedingly acrid and irritating. The distressing feelings excited in many dyspeptics by mutton fat, butter, and fish oils, are, in this way, readily accounted for. Butter contains no less than three volatile, fatty acids, namely--the butyric, capric, and capröic. Fats, by exposure to the air, become rancid, and in this state are exceedingly obnoxious to the digestive organs. Their injurious qualities depend on the presence of volatile acids, and in part also on non-acid substances."

These statements show the reasons why the fried food of all kinds is injurious. Fat is an unhealthful aliment, and when heated becomes still more so. This mode of cooking, then, should be given up by every housekeeper, who intends to take all reasonable means of preserving the health of her family. There are an abundance of other modes of preparing food, without resorting to one which involves danger, especially to children and invalids, whose powers of digestion are feeble.

The most common modes of preparing unhealthful food, is by frying food, and by furnishing bread that is heavy, or sour, or so newly baked, as to become clammy and indigestible when chewed. Though there are many stomachs that can for a long time take such food without trouble, it always is injurious to weak stomachs, and often renders a healthful stomach a weak one. A housekeeper that will always keep a supply of sweet, light bread on her table, and avoid oily dishes, oily cooking, and condiments, will double the chances of good health for her family.

"Water," says Dr. Pereira, "is probably the natural drink of all adults. It serves several important purposes in the animal economy:-firstly, it repairs the loss of the aqueous part of the blood, caused by evaporation, and the action of the secreting and exhaling organs ; secondly, it is a solvent of various alimentary substances, and, therefore, assists the stomach in digestion, though, if taken in very large quantities, it may have an opposite effect, by diluting the gastric juice ; thirdly, it is a nutritive agent, that is, it assists in the formation of the solid parts of the body."

The health of communities and of individuals is often affected by the nature of the water used for drink, and it is therefore important to know how to secure pure and good water.

Rain water is the purest of all water, purer than the best spring water. Of course every person who fears that the water used is the cause of any evil, can obtain that which is known to be pure and good. The cheapest mode of obtaining good rain water, is to have a large cistern dug in the vicinity of some large building, with conducting spouts. This can be lined with water lime, and the water thus obtained, when cooled with ice, is as pure as any that can be found.

A distinguished medical writer, Dr. Cheyne, remarking on the effects of foreign substances in water, states these facts:-

The other drinks in most common use are arranged thus,--

1. The Mucilaginous, Farinaceous, or Saccharine drinks.

These are water chiefly, with substances slightly nutritive, softening, and soothing. Toast water, Sugar water, Rice water, Barley water, and the various Gruels, are of this kind.

2. The Aromatic and Astringent drinks.

These include Tea, Coffee, Chicory, Chocolate, and Cocoa.

The following remarks on these drinks are taken from the work of Dr. Pereira.

"The peculiar flavor of tea depends upon the volatile oil, which has the taste and smell of tea. Alone, it acts as a narcotic, but when combined (as in tea) with tannin, it acts as a diuretic and diaphoretic (i.e. to promote the flow of urine and perspiration). Its astringency, proved by its chemical properties, depends upon the presence of tannin. Of this quality we may beneficially avail ourselves in some cases of poisoning, as by poisonous mushrooms, by opium, or laudanum."

"The peculiar influence of tea, especially the green variety, over the nervous system, depends upon the vegetable oil referred to. The influence is analogous tothat of foxglove; for both green tea and foxglove occasion watchfulness, and act as sedatives on the heart and bloodvessels. Strong green tea produces, on some constitutions, usually those popularly known as nervous, very severe effects. It gives rise to tremor, anxiety, sleeplessness, and most distressing feelings."

"As a diluent and sedative, tea is well adapted to febrile and inflammatory disorders. To its sedative influence should be ascribed the relief of headache sometimes experienced."

On this subject, Dr. Lee remarks, "Green tea undoubtedly possesses very active medicinal properties; for a very strong decoction of it, or the extract, speedily destroys life in the inferior animals, even when given in very small doses. The strongly marked effects of tea upon persons of a highly nervous temperament, in causing wakefulness, tremors, palpitations, and other distressing feelings, prove, also, that it is an agent of considerable power. It not unfrequently occasions vertigo, and sick headache, together with a sinking sensation at the pit of the stomach, shortly after eating. It is also opposed to active nutrition, and should, therefore, be used with great moderation by those who are thin in flesh. From its astringent properties it often is useful in a relaxed state of bowels."

"We are satisfied that green tea does not, in any case, form a salubrious beverage to people in health, and should give place to milk, milk and water, black tea, milk and sugar, which, when taken tepid, form very agreeable and healthy drinks."

Coffee. "The infusion, or decoction of coffee, forms a well known favorite beverage. Like tea, it diminishes the disposition to sleep, and hence it is often resorted to by those who desire nocturnal study. It may also be used to counteract the stupor induced by opium, alcoholic drinks, and other narcotics. In some constitutions it acts as a mild laxative, yet it is usually described as producing constipation. The immoderate use of coffee produces various nervous diseases, such as anxiety,tremor, disordered vision, palpitation, and feverishness."

Chicory, or Succory. This is the roasted root of the Wild Endive, or Wild Succory. It is prepared like coffee, and some prefer its flavor to that of coffee.

Chocolate. This is prepared by roasting the seeds of the Cacoa, or Cocoa, then grinding them and forming them into cakes. "Chocolate, though devoid of the disagreeable qualities of tea and coffee, which disturb the nervous functions, yet is difficult of digestion, on account of the large quantity of oil which it contains, and is, therefore, very apt to disturb the stomach of dyspeptics."

Cocoa. This is made of the nuts and husks of the cocoa, roasted and ground, and is somewhat less oily than chocolate, and being rather astringent, is adapted to looseness of the bowels. The shells alone are often used to make a drink, which is less rich than the Cocoa, and especially adapted to weak digestive powers.

The seeds of the vegetable called Ochra, roasted and prepared like coffee, are said to equal it in flavor.

3. Acidulous Drinks.

"The employment of vegetable acid, as an aliment, is necessary to health. It seems pretty clearly established, that complete and prolonged abstinence from succulent vegetables, or fruits, or their preserved juices, as articles of food, is a cause of scurvy."

"Water, sharpened with vegetable acids, oftentimes proves a most refreshing beverage, allaying thirst, and moderating excessive heat. Various acids form cooling, refreshing, and antiscorbutic drinks, and are well adapted for hot seasons, and for febrile and inflammatory cases."

These drinks are prepared by dissolving vegetable acids or acidulous salts in water, sweetening and flavoring it. Also, by decoctions of acid fruits, which promote secretions in the alimentary canal, and act as laxatives.

The carbonated or effervescing drinks belong to this class. They owe their sparkling briskness to carbonic acid gas confined in the liquid.