INDEX OF SUBJECTS. 



Wherever subjects are presented at greater length it is indicated by bold- 

 faced type. 



ABSORPTION, 249; problem of, 249; nature of substances con- 

 cerned in, 250; forces active in, 250, 257; role of osmotic 

 pressure in, 262, 263, 264, 265; role of colloids in, 267; of 

 salts, 274 (see also Salts); of water, 26& 269; of carbo- 

 hydrates, 282 (see also Carbohydrates); of fats, 287 (see 

 also Fats); of proteins, 299 (see also Proteins); of lipoid- 

 soluble substances, 268, 278, 279; effect of chemicals on, 

 280 



ABSORPTIVE SYSTEM, alimentary tract as, 249 



ACETIC ACID, 106 



ACID-PROTEINASE, 114; distribution of, 114; in stomach, 67, 114; 

 preparation of, 114; chemical character of, 115; effect of 

 acids on, 116; effect of chemical substances on, 118; effect 

 of temperature on, 120; action of, on fibrin, 120; products 

 of digestion by, 121; compared with alkali-proteinase, 122; 

 role of, in protein absorption, 300, 301 



ACIDS, as electrolytes, 260 ; organic, of alimentary contents, 321 



ADAPTATION of digestive glands to food, 234 ; mechanism of, 236 



AFFINITY, mechanical, 250 



ALCOHOL, ethyl, 106 



ALCOHOLS, diffusion of, into protoplasm, 271 ; absorption of, by 

 alimentary tract, 278, 279 



ALDEHYDES, diffusion of, into protoplasm, 271 

 , behavior of, in various solutions, 270, 271 



333 



