450 



Fig. 5. 



Fig. 6. 

 col. ep, c. t. 



col. ep. 



, col. ep. 





coZ. ep. 



e.t. 



s.c. 



eh. c. 





S-j.c^ ■ <^^ 



ch. c. 



— m. circ. 



~-^--- h.v. 



:^ m.long. 



ser. 



tirf ^ 



Fig. 7. 

 rfe^f. ep. 



cap. 



c. b. c. 









'^ 



eoZ. ep. 





Fig. 5. The same through whole thickness of wall of pyloric appendage (estuary 

 salmon) to .show arrangement and the identity of its structure with that of the intestine. 

 Hsematozylib and eosin. 



Fig. 6. Portion of a longitudinal section through a fold of intestinal mucous mem- 

 brane (estuary salmon). Hsematoxylin and eosin. 



Fig. 7. Intestine of salmon from mouth of river, showing a patch of normal epi- 

 thelium at the bottom of one of the folds, and the process of degeneration and desquam- 

 ation which the cells are undergoing. Hematoxylin and eosin. 



On microscopic examination of the appendages and intestine of 

 the salmon it is found that this appearance corresponds to a state 

 of desquamative catarrh exactly like that found in the stomach. 



