DIGESTIVE POWER OF GASTRIC JUICE. 33 



Dr. Chigin on dogs with isolated miniature stomachs have shown that 

 both a mixed diet, as well as the separate administration of milk, bread 

 or meat, &c., produce each time characteristic modifications of activity 

 of the gastric glands. The speciality of the work applies not alone to 

 the properties of the juice, but to the rate and duration of its secretion, 

 and also to its quantity. We will deal with these points in order. 



The greatest digestive power belongs to the juice poured out on 

 bread, which for shortness we may name "bread-juice."* Its mean 

 proteolytic power, according to Dr. Chigin, is represented by G-G4 mm. 

 A diet of flesh calls forth a juice of 3-99 mm. digestive power, and one 

 of milk of :5-2G mm. If we now turn to a comparison of these juices 

 with one another we find, according to the law of Schiitz and Borrisow, 

 that "bread juice" is represented by 44 (G'G4 2 ), "flesh juice" by 

 1C (8-99-), and " milk juice " by 11 (3-2G 2 ). 



In other words, "bread juice" contains four times as much ferment 

 as "milk-juice," and, is in this respect, four times as concentrated. 



The matter may be illustrated by the following protocols taken from 

 experiments of Dr. Chigiu : 



At eight o'clock in the morning the dog was given 200 grms. of 

 bread to eat. 



Time. Hourly quantity of juice in c.c. Digestive power in mm. 



8-9 A.M 3-2 ... 8-0 



10 4-5 ... 7-0 



11 . . 1-8 7-0 



Dog then given 200 gruis, raw meat. 



12 noon 8'0 5-37 



1 P.M 8-8 3-50 



2 8-G 3-75 



Dog now received 200 c.c. milk. 



3 P.M 9-2 3-75 



4 8-4 ... 3-30 



An additional 400 c.c. of milk now given. 



5 P.M 7-4 2-25 



6 4-2 ... 2-2 



The influence of the different foods upon the digestive power of the 

 juice is striking. In order to exclude the possibility that the order 

 of administration could have influenced the result I append another 

 experiment. 



* In harmony therewith \ve shall also speak of "meat-juice" and "milk-juice" 

 instead of the longer, but more correct, terms of "juice secreted after the adminis- 

 tration of meat and milk" respectively. 



C 



