340 INDEX. 



N. 



NERVES. Are the conductors of the vital force, and of mechanical 

 effects, 208. Effects of the disturbance of their conducting power, 

 218. They are not the source of animal heat, 28. 



NERVODS LIFE. Distinguished from vegetative, 36. 



NERVOUS MATTER. Contains albumen, and fatty matter of a pecu- 

 liar kind, 43. Vegetables cannot produce it, 49. The fat of yolk 

 of egg probably contributes to its formation, 103. The phosphoric 

 acid and phosphates, formed in the metamorphosis of the tissues of 

 the herbivora, are retained to assist in the formation of nervous mat- 

 ter, 77. The vegetable alkalies affect the nervous system, 172-174. 

 Composition of cerebric acid, 174. Theory of the action of the veg- 

 etable alkalies, 175. 



NITROGEN. Essential to all organized structures, 42, 43. Substances 

 in the body which are destitute of it not organized, 43. Abounds 

 in nutritious vegetables, 45. Nutritious forms in which it occurs, 

 ib. et seq. Occurs in all vegetable poisons, 167 j also in a few sub- 

 stances which are neither nutritious nor poisonous, but have a pecu- 

 liar effect on the system, such as caffeine, 167 et seq. 



NITROGENIZED. See Azotized. 



NoN-AzoTizED. Constituents of food. See Starch. 



NUTRITION. Depends on the blood, 38. On albumen, fibrine, or 

 caseine, 38 et seq. Elements of nutrition, 92. Compounds of pro- 

 teine alone are nutritious, 101. Occurs when the vital force is 

 more powerful than the opposing chemical forces, 188. Theory of 

 it, 199. Is almost unlimited in plants from the absence of nerves, 

 201. Depends on the momentum of force in each part, 216. De- 

 pends also on heat, 231. 



o. 



OATS. Amount required to keep a horse in good condition, 72. An- 

 alysis of, 287. 



OIL OF BITTER ALMONDS. Its composition. How related to benzoic 

 acid, 267, 268. 



OLD AGE. Characteristics of, 236 et seq. 



OPPERMANN. His analysis of wax, 296. 



ORGANIZED TISSUES. All contain nitrogen, 42, 43. All such as are 

 destined for affecting the change of matter are full of small vessels, 

 212. Their composition, 120. The gelatinous and cellular tissues, 



