FOOD. 19 



quantity of water be obtained. The water is more essential under these 

 circumstances than the solid matters, which can be supplied by the 

 organism itself. 



The food consumed daily is a heterogeneous compound consisting of 

 both nutritious and innutritious portions. The nutritious portions are 

 known as the alimentary principles, while the food, as a whole, is known 

 as aliment. 



The different alimentary principles which are appropriated by the 

 system are combined dn different proportions in the various articles of 

 food, and are separated from the innutritious substances during the 

 process of digestion. They belong to the organic and inorganic worlds, 

 and may be classified, according to their chemical composition, as 

 follows : 



CLASSIFICATION OF ALIMENTARY PRINCIPLES. 



1. Albuminous group nitrogenized, C. O. H. N. S. P. 



PRINCIPLE. WHERE FOUND. 



Myosin, syntonin Flesh of animals. 



Vitellin, albumen Yolk of egg, white of egg. 



Fibrin, globulin Blood contained in meat. 



Casein Milk, cheese. 



Gluten Grain of wheat and other cereals. 



Vegetable albumen Soft growing vegetables. 



Legumin Peas, beans, lentils, etc. 



Gelatin Bones. 



2. Saccharine group non-nitrogenized, C. O. H. 



Cane sugar, beet root sugar Sugar cane, beets, etc. 



Glucose, grape sugar Fruits. 



Inosite, liver sugar, glycogen M uscles, liver, etc . 



Lactose or milk sugar , Milk. 



Starch Cereals, tuberous roots and leguminous 



plants. 



3. Oleaginous group non-nitrogenized, C. O. H. 



Animal fats and oils ~\ Found in the adipose tissue of animals, 



Stearin, olein >- seeds, grains, nuts, fruits, and other 



Palmatin, fatty acids J vegetable tissues. 



4. Inorganic group. Water, sodium and potassium chlorides, sodium, 

 calcium, magnesium and potassium phosphates, calcium carbonate and iron. 



5. Vegetable acid group. Malic, citric, tartaric and other acids, 

 found principally in fruits. 



6. Accessory foods. Tea, coffee, alcohol, cocoa, etc. 



The Albuminous principles enter largely into the composition of the 

 body, and constitute the organic bases of the different tissues; they are 



