504 



APPENDIX. 



He proves by experiments which are fully described in his 

 Thesis, that the acid which is liberated on the application of heat 

 consists of much butyric acid, with a little metacetonic and, pro- 

 bably, acetic acid ; and that the human gastric juice contains no 

 free hydrochloric acid. He regards the butyric and lactic acids as 

 products of the metamorphosis of the carbo-hydrates ; and, finally, 

 he is persuaded that the acid reaction of the gastric juice, when 

 mixed with food, owes its origin to the organic acids which are 

 contained in or developed from that food. 



Schroeder's Thesis is divided into three sections. In the first 

 he considers the action of the human gastric juice on amylaceous 

 matters ; in the second, its action on the albuminates, and espe- 

 cially on flesh ; and in the third, he briefly notices the part which 

 it takes in the metamorphosis of matter. The only point especially 

 deserving of notice is the description of the analyses of the ga trie 

 juice of the same woman, obtained unmixed with food, by irritating 

 the gastric mucous membrane of the empty stomach with pease. 

 An acid, clear gastric juice was then obtained, containing free 

 hydrochloric acid ; it would thus appear that in Gruenewaldt^s 

 experiments, this acid had been neutralised by the alkali of the 

 saliva. G. E. D.] 



(10) Addition to p. 68, line 7 from bottom. The differences 

 in the physical characters and in the composition of freshly 

 secreted bile and of bile that has been retained for a long time in 

 the gall-bladder, have been successfully investigated by Bidder and 

 Schmidt. The fresh bile of carnivorous animals (dogs, cats, crows) 



