INDEX. 849 



varies with the temperature, dryness, and density of the air, 

 IG. Is carried by arterial blood to all parts of the body, 171. 

 Fat differs from sugar and starch only in the amount of oxy- 

 gen, 84. It also contains less oxygen than albumen, fibrine, 

 &c., 86. The formation of fat depends on a deficiency of oxy- 

 gen, 88 et seq. ; and helps to supply this deficiency, 89. Oxy- 

 gen essential to digestion, 113. Relation of oxygen to some 

 of the tissues formed from proteine, 126. Oxygen and water, 

 added to blood or to flesh, yield the elements of bile and of 

 urine, 135. Action of oxygen on uric acid, 136, 139 ; on 

 hippuric acid, 82, 139 ; on blood, 140 ; on proteine, with uric 

 acid, 151 ; on proteine and starch, with water, 152 ; on cho- 

 leic acid, 154 ; on proteine, with water, 154. By depriving 

 starch of oxygen and water, choloidic acid may be formed, 157. 

 Oxygen is essential to the change of matter, 173. Its action 

 on the azotised constituents of plants when separated, 213. 

 Its action on the muscular fibre essential to the production of 

 force, 220 — 226. Oxygen is absorbed by hybernating animals, 

 241. Is the cause of the waste of matter, 243 ; and of animal 

 heat, 244, 252. Blood-letting acts by diminishing the amount 

 of oxygen which acts on the body, 258. Its absorption is the 

 cause of the change of colour from venous to arterial blood, 

 265. The globules probably contain oxide of iron, protox- 

 ide in venous blood, peroxide in arterial, 267 et seq. All 

 parts of the arterial blood contain oxygen, 173, 174, 266, 



271. 



P. 



Pears. Analysis of starch from unripe, 297. 



Peas. Form part of the diet of soldiers in Germany, 287, 289. 



Abound in vegetable caseine, 47. Analysis of peas, 285 ; of 



starch from peas, 296. 

 Pepys and Allen. Their calculation of the amount of inspired 



oxygen, 283. 

 Peroxide of Iron. Probably exists in arterial blood, 267 et seq. 

 Pfluger. His analysis of the gas obtained by puncture from the 



abdomen of cattle after excess in green food, 309. 

 Phenomena of motion in the animal body, 195 et seq. 

 Phosphates. See Bones. 

 Phosphoric Acid. See Acid, Phosphoric. 

 Phosphorus. Exists in albumen and fibrine, 41, 48, 126. It is 



