Bolton. 



Roy. Sor. Proc., vol. 74, Plate 8. 



*.k 



Stomach of G-uinea-pig slicking Two Ulcers. The animal received an injection of 

 12 c.c. of a weak gastrotoxic serum, and after 24 hours it was killed. 



The serum was prepared by injecting a rabbit with fresh extract of guinea-pig's 

 stomach cells. 



Stomach of Guinea-pig showing a Large Ulcer situated on the Greater Curvature 

 and several Smaller Ones. The animal received an injection of 12 c.c. of 

 gastrotoxic serum, and was almost dead after 24 hours, when it was killed. 



The serum in this case was prepared by injecting a rabbit with rabbit's stomach 

 cells ; in the other four cases guinea-pig's stomach was used for injection. 



