which contain large quantities of fat, such as nuts, oily seeds, etc. All vegetables contain more or less fat, although the succulent vegetables usually contain but little thereof. Of starchy foods there are no types in animal food, the quantity of carbohydrate material therein being extremely limited. The lobster and horse-flesh contain perhaps a little more than 1 percent of carbohydrate food, but most meats contain much less than that. Sugar and starch are typical carbohydrate foods.

The cereal grains are composed largely of starchy foods, and so are certain tubers, such as the potato, cassava, etc. Of the common cereals rice contains more starch than any other and oats the least. Sugars are intimately related to starch and are included under the term starchy food or carbohydrate food. The carbohydrate matter in the flesh mentioned above, namely glycogen, is of the nature of a sugar. Among the typical sugar foods are beets, melons, and fruits, some of which contain large percentages of sugar. All fruits contain greater or less quantities of sugar, and that is true, also, of all vegetables.

Of the plants which produce the sugar of commerce there may be mentioned the sugar-cane, the sugar-beet, the maple, and palm trees. The principal sources of the sugar of commerce are the sugar-cane and the sugar-beet.

Of the condimental foods may be mentioned spices, including pepper, mustard, cinnamon, allspice, and other foods of this class. Common salt occupies a unique position in food products. It is the only mineral substance which has any value as a condiment in human food. But it also has a more important function than its condimental character, namely, it furnishes the supply of hydrochloric acid without which digestion in the stomach could not. take place. For this reason common salt must be regarded as an essential food product as well as a condiment.

EXPLANATION OF CHEMICAL TERMS.

Inasmuch as this manual is not solely intended for expert chemists and physiologists but also for the general public, a simple explanation of the use of the terms used in analytical data and tables is advisable.

Under the term moisture is included all the water which is present in a free state, that is, not combined in any way with the ingredients of the material, and other substances volatile at the temperature of drying. The water is determined by drying to a constant weight at the temperature of boiling water or slightly above. In bodies which are easily oxidized this drying takes place in a vacuum or in an inert gas like hydrogen or carbon dioxid.

Protein. Under this term is included all the nitrogenous compounds in a food product which contain in their composition sulfur, nitrogen, car

EXPLANATION OF CHEMICAL TERMS.

9 bon, hydrogen, and oxygen, forming that class of tissues represented by the gluten in wheat, the white of an egg, muscular and tendinous fibers, etc.

Ether Extract.-Under this term is included the fats and oils, the term fat being applied to animal fat and the term oil to vegetable products. These bodies are all soluble in ether and therefore are grouped together under the term "ether extract." There are some fats both in animal and vegetable substances insoluble in ether, but they exist in minute quantities and therefore are not separated from the extracts, but the whole matter is given together and represents practically the fats and oils in food.

There are also minute quantities of bodies not fats in foods soluble in ether, and these are included in the ether extract.

Ash. The term ash is applied to the residue left after the burning of food products in the air at a low temperature until the carbon has disappeared. Ash is rather an indefinite term and is applied to that residual material of a mineral nature composed of sand or silica and the carbonates or oxids of alkaline earth or alkalies. The ash also contains the principal part of phosphorus present in food products and usually a small proportion of sulfur. These bodies in the ash exist as phosphoric and sulfuric acids or their salts.

Fiber. The term fiber is applied to those carbohydrate products in food which are insoluble in solutions of dilute acid and dilute alkalies at the boiling temperature. Inasmuch as these separated bodies are not wholly pure cellulose they are often designated as crude fiber.

Starch and Sugar.-The terms starch and sugar are applied to the carbohydrates in a food product of a starchy or saccharine nature, together with the other carbohydrates present which are soluble in dilute acids and alkalies.

Calories. The term calorie is used to denote the amount of heat-forming material contained in one unit weight of a food product. The number given represents the number of degrees of temperature produced in a unit mass of water by the heat formed in burning the unit weight of food. The unit weights employed are usually as follows: Of the food product, one gram (15 grains); unit weight of water to be heated, one kilogram (2.2 pounds); unit increment of temperature, 1° C. (1.8° F.). The expression 4000 calories therefore means that if one gram of food substance in a dry state be burned the heat produced will raise one gram of water through a temperature of 4000°C., or the unit of water (one kilogram) through a temperature of 4° C. For convenience the calories are usually expressed as small calories, namely 4000, instead of large calories, namely 4. In this manual the expression in terms of small calories, that is, the temperature increase of one kilogram of water produced by burning one gram of substance, multiplied by 1000, will be uniformly employed.

FOODS

AND THEIR

ADULTERATION.

PART I.

MEATS.

One great division of human food is meat. Technically, perhaps, the edible flesh of every animal used for human food might be described as meat. In this manual, however, preference is given to the common meaning of the term.

The flesh of animals is by common consent divided into three principal classes, namely, the flesh of terrestrial mammals, or animals not provided with wings; second, aerial animals, or animals provided with wings, and, third, aquatic animals. A very common classification of these three kinds of food is flesh, fowl, and fish. There are animals, the flesh of which is eaten by many, which are not exactly included in this classification; for instance, animals of an amphibious nature, living partly on land and partly on sea. Also many of the animals classed as aerial live chiefly upon the earth; although having wings they do not use them, such as domesticated fowls. This classification, however, is sufficiently exact for the practical purposes of a food manual and, therefore, under the head of meat is included the edible flesh of mammals living on the land.

Animals Whose Flesh is Edible.-Probably the only complete classification of this kind would be to include every animal living on the face of the earth since, perhaps, the flesh of every animal living has been more or less eaten by man. In a civilized community, however, except in times of disaster and dire necessity, certain classes of animals only furnish the principal meat food. Nearly all the meat food consumed in the United States is derived from cattle, sheep, and swine. Goat flesh is eaten only to a limited extent and horse meat scarcely at all, and the only other meats of importance are those of

wild animals. The principal wild animals used for food are the deer, bear, rabbit, and squirrel. Many other wild animals, however, are eaten and in some cases highly prized. In this manual only the principal meat foods both of domesticated and wild animals will be mentioned.

Classification of Meat Food as Respects Age.-The edible flesh of domesticated animals as well as of wild animals is eaten both in the young and full-grown state. Common names, however, designate these different classes. For instance, veal in the growing and beef for the full-grown animal, lamb for the young and mutton for the full-grown sheep, pig in the younger and pork in the full-grown swine, etc. There is no legal limit of age for such a distinction, but as long as the animal is not fully grown it may be classified under the name representing the young animal. There is a common understanding, however, that in the case of veal and lamb the animal must be under one year of age and usually not under two nor more than eight months of age. A classification of this kind is so indefinite, however, that no strict definition can be given other than that founded on the general principles above outlined.

Preparation of Animals.-The proper sanitary conditions attending the fattening of animals intended for slaughter are of great importance to the consumer. It is a common understanding that animals intended for slaughter should be plump and healthy. Poor animals, either those which are meager from lack of food or from disease, are to be rigidly excluded from the slaughter pen. Animals intended for slaughter should be fattened under sanitary conditions with plenty of fresh water and fresh air as well as good food. The stalls in which they are fattened should be clean and well ventilated, and the sanitary conditions surrounding them should be such as to exclude contagious and epidemic diseases and provide the most favorable environment for growth and preparation for the market.

It is evident that all these conditions are to be secured by proper inspection of the animals while preparing for the market. The time will, doubtless, soon arrive in this country when the supervision of the preparation of animals. for the market, the sanitary conditions under which they live, and the general environment which surrounds them shall be subjects of local, municipal, and state inspection. Since the power of the general government cannot extend to states and municipalities, these corporate bodies should take uniform and scientific action concerning all these matters. National and state conventions of municipal and state sanitary authorities should decide upon uniform systems of inspection and sanitation to which all state and municipal authorities must agree, so that a uniform and effective method of inspection and sanitation will be secured throughout the country.

When animals are transported before slaughter from one state to another the national government is then entitled to inspect and certify respecting the