American Flskeries iSociety. 207 



Now, in the winter, although the mummichog was the most 

 hard}' species we had in the aquaria, still they would die rapidly. 

 Some lived two or three weeks, but all died, and some would die 

 in a very few days — much more rapidly than they do now. 



I might add to that about the popeye, that I think there is 

 even another sort of popeye than the one mentioned by Prof. Gor- 

 ham. I remember one case at the Manchester station where the 

 lake trout had the eye almost out of the head, and you could 

 fjuncture the globe of the eye and see the evolution of gas. I do 

 not know that there is any excess of air there. If not that would 

 remove any explanation from that direction. Now, the pressure 

 explanation could hardly apply to them, because they have been 

 at that station all their lives and have never been in deep water. 

 I understand they were hatched there; that popeye is due ver}' 

 likely to bacterial infection, producing gas. 



