The following interesting table, obtained at the National Museum, gives the principal compounds of the body. Some of the more rare organic compounds are omitted.

Water:-A compound of oxygen and hydrogen.

Protein Compounds, composed mainly of

Carbon, <

Oxygen,

Hydrogen,

Nitrogen.

*

Albuminoids or < Proteids.

' Myosin and syntonin of muscle (sometimes called "muscle fibrin"). Albumen of blood and milk. Cat sein of milk.

Gelatinoids. <

r Collagen of bone and " tendons. Chondrigen of carti-, lage, gristle, .

which > yield gelatin.

Hemoglobin. <

The red coloring matter of blood.

Fats, composed mainly of

Carbon,

Oxygen,

Hydrogen,

Neutral Fats. *

Stearin, Palmitin, Olein, etc.

These make up the bulk of the fat of the body. >• They are likewise the chief constituents of tallow, lard, etc.

Complex

Fats, containing < phosphorus k and nitrogen.

Protagon, Lecithin, Cerebrin.

Found chiefly in

> the brain, spinal cord, nerves, etc.

Carbohydrates, composed of

Carbon,

Oxygen,

Hydrogen.

Glycogen, "animal starch." Occurs in the liver and other organs. Inosite, "muscle sugar." Occurs in various organs. Lactose, "milk sugar." Occurs in milk. Cholesterin. Occurs in brain, nerves, and other organs.

Mineral Salts.

Phosphate of lime, or calcium phosphate.

Carbonate of lime, or calcium carbonate.

Fluorid of calcium, or calcium fluorid.

Phosphate of magnesia, or magnesium phosphate.

Occurs chiefly in bones and teeth, though found in other organs.

Phosphate of potash, or potas-sium phosphate.

Sulphate of potash, or potassium sulphate.

Chlorid of potassium, or potassium chlorid.

Phosphate of soda, or sodium phosphate.

Sulphate of soda, or sodium sulphate.

Chlorid of sodium, or sodium chlorid.

Distributed through the body in the blood, muscle, brain, and other organs.

Now, since the body is composed of these substances, our food, including air and water, should contain them all in due proportion, that the growth, energy, and repair of the body may be healthfully maintained.