Boltun. 



Roy. Sac. Proc., vol. 74, Plate 9, 





Section of Stomach Wall of 

 Guinea-pig showing a large 

 area of Necrosis in the Mucous 

 Membrane. The animal re- 

 ceived an injection of 4 c.c. of 

 gastrotoxic serum, and was 

 killed 24 hours afterwards. 



Section of Stomach Wall of 

 Guinea-pig at the edge of a 

 Necrotic Patch. A blood-vessel 

 containing normal red cor- 

 puscles can be seen in the 

 patch. The animal received 

 5 c.c. of gastrotoxic serum, and 

 was killed the next day. 



Section of Stomach Wall of 

 Guinea-pig showing an Ulcer. 

 The animal received 10 c.c. of 

 weak gastrotoxic serum, and 

 was killed 48 hours afterwards. 



