LONDON'S STUDIES 71 



segments of the bowel, nitrogen partition in the intestinal 

 contents, the completeness of food utilization, the results of 

 exclusion of special segments of the intestine, of the bile and 

 of the pancreatic secretion, protein digestion in mixed diet 

 especially in presence of carbohydrates and fats, the specific 

 adaptation of the digestive juices and the relative amounts 

 of enzymes in the intestinal chyme in different diets, the dif- 

 ferences between raw and cooked proteids, the behavior of 

 various proteins (as serum albumin, egg albumin, muscle 

 albumin, casein, gliadin, gelatin and elastin) and of digestive 

 mixtures (removed through a fistula from one dog and 

 introduced by a fistula into another dog), the resorption of 

 individual aminoacids, the mechanism of secretory flow, the 

 influence of blood pressure and other physiological factors 

 upon secretion of the individual digestive juices, and other 

 similar subjects. He has endeavored, too, to deduce a 

 mathematically fixed relation between the different secretory 

 factors (as the relations between the amount of food, the 

 concentration of the gastric juice, the quantity of the bile 

 and pancreatic juice, the alkali-content of the pancreatic and 

 intestinal secretions, the nitrogen-content of the different 

 secretions and the digestion time of solid albumins) in which 

 as in chemistry of the ferments " quadrate root rules " (in 

 Arrhenius' sense) play an important part. 62 



The author confesses that he does not regard himself as 

 fitted to criticise with full appreciation this remarkable 

 wealth of undoubtedly very valuable observations. It would 

 be a real service were London to take upon himself the duty 

 of critically reviewing them in their proper relations and of 

 bringing out clearly the lines of thought he has followed, 

 which are now so divided among so many separate publica- 

 tions that the outsider is bound to lose their connection. 



82 Consult also E. London and C. Schwarz, Zeitschr. f. physiol. Chem., 68, 

 346, 1910; L. Popielski, ibid., 71, 186, 1911. 



