As chemical compounds are not known to Osteopathy to be used as remedies, then its use as a study for the student is only to teach that elements in nature do combine and form other substances, and without changes and unions, no teeth, bone, hair, or muscle could appear in the body from the food eaten. Then chemistry is of great use as a part of a thorough Osteopathic education. It gives us the reasons why food is found in the body as bone, muscle and so on, to all kinds of flesh, teeth and bones found in animal forms. Unless we know chemistry reasonably well, we can not do away with much mental worry of what becomes of food after eating. By chemistry the truths of physiology are firmly established in the mind of the student of nature, that in man a chemistry of wonderful powers does all the work of animal forms, and that in the laboratory of nature's chemistry is the ruling power. By elementary chemistry we are led to see the beauties of physiology only. Thus chemistry of the elementary is one, and physiology is the witness that it is law in man as in all nature. Thus in chemistry we comprehend some of the laws of union in nature which we can use mentally with knowing confidence. In chemistry we become acquainted with the law of cause and change in union, which is a standard law sought by the student of Osteopathy. NATURE'S CHEMISTRY. Osteopathy believes that all parts of the human body do work on chemical compounds, and from the general supply manufacture for local wants; thus the liver builds for itself of the material that is prepared in its own division laboratory. The same of heart and brain. No disturbing or hindering causes will be tolerated to stay if an Osteopath can find and remove it. We must reason that to withhold the supply from a limb, to wither away would be natural. We suffer from two causes. First, want of supply (hunger), and the burdens of dead deposits along nerve centers, which five nerves by chemical changes while in fermentation should regulate local or general divisions. CORRECT METHOD OF REASONING.