of the Secretion of the gastric Glands. 97 



the purpose of coagulating milk, proves, that every part of 

 that membrane possesses such a power. 



Mr. Hunter ascertained, that the mucus found in the first, 

 second, and third cavity of the calf's stomach, dissolved in 

 water, had no power of coagulating milk, while a solution of 

 the mucus of the fourth cavity possessed that property, and 

 retained it even after it had been so long kept, as to begin to 

 become putrid. 



When the calf has left off sucking, and is old enough to be 

 killed for veal, the inner membrane of the fourth cavity of 

 the stomach readily coagulates milk. 



If different portions of the inner membrane of the hog'$ 

 stomach are prepared as rennet, no part coagulates milk but 

 that near the pylorus, and I have shewn, in a former paper, 

 that the gastric glands are situated there. 



The crop and gizzard of a cock were prepared as rennet, 

 milk was coagulated in half an hour by that of the gizzard, in 

 two hours by that of the crop. 



The contents of a shark's stomach coagulated milk imme- 

 diately; portions of the stomach washed and steeped sixteen 

 hours in water, formed a solution which produced the same 

 effect. 



Rennet made from the stomach of a salmon coagulated milk 

 in four or five hours ; when made from the stomach of th©^ 

 thornback, it produced the same effect. 



These experiments shew, that the secretions of the stomach 

 have a power of coagulating milk ; they do not, however, 

 explain whether this power belongs to any one secretion in 

 particular, or to a mixture of them all. 



With a view to ascertain to what particular secretions this 



MDCCCXIII. O 



