ADDITIONS AND NOTES TO VOL. II. 501 



mixed gastric juice, was a little above 1 '7 o, while the mineral con- 

 stituents averaged 1'0-J. 



Schmidt found no essential difference in the composition of the 

 gastric juice of dogs, after they had been fed for a long time solely 

 with vegetables, or solely with flesh. It cannot, however, be a mere 

 accidental co-incidence, that the highest numbers for the phos- 

 phate of iron were found in four cases after the use of vegetable 

 food. 



(7) Addition to p. 53, line 15. In order to determine the 

 daily quantity of gastric juice which is secreted, Bidder and Schmidt 

 employed dogs with gastric fistulse, which they made to lie on the 

 left side when the secretion commenced, by which means the pas- 

 sage of any part of the gastric juice through the pylorus into the 

 duodenum was prevented : the secretion was, moreover, collected 

 on various days (with a considerable interval between them) and at 

 different periods after the last meal. They collected 823 grammes 

 of gastric juice from a dog weighing 16 kilogrammes, which on the 

 whole was submitted to 14 observations, extending over 12 hours. 

 (These observations of course not being continuous.) Another dog 

 weighing 12 kilogrammes yielded 231 grammes in 4 hours (it 

 having been submitted to 6 observations). In the first case there 

 were 103, and in the second, 115 grammes of gastric juice secreted 

 for each kilogramme's weight of the animal. We may, therefore, 

 assume that the dog yields, at the least, 10J of its weight of gastric 

 juice in 24 hours. We further know that in the healthy state the 

 secretion of gastric juice is for the most part dependent on the 

 ingestion of food, and that some kinds of food excite a more copious 

 flow of this fluid than others. There are some substances, such, for 

 instance, as sugar, aromatics, spirits, and alkalies, which when intro- 

 duced into the stomach, immediately excite an almost gushing 

 secretion of gastric juice, while other substances, as for instance, 

 animal food, require a far larger quantity of gastric juice for their 

 metamorphosis, in consequence of the much longer time of their 

 retention in the stomach. 



(8) Addition to p. 59, last line. It further follows from the 

 numerous experiments of Bidder and Schmidt, that pure gastric 

 juice considerably exceeds gastric juice mixed with saliva in its 

 digestive power, a fact obviously dependent on a portion of the 

 free acid of the gastric juice being saturated by the alkaline saliva. 

 They likewise found that the addition of bile to the gastric juice 



