American Fisheries Society 259 



obtained by photographing from the dark hood, through 

 the aquarium toward the Hght, when care was taken to use 

 all available reflected light. 



I have purposely omitted from this paper all reference to 

 the practice of photography. There are many works deal- 

 ing with the practical side. The wide field which photog- 

 raphy now covers admits of accepting the ordinary practices 

 as matters of common knowledge, and the foregoing pur- 

 ports to be nothing more than the development and perfec- 

 tion of certain methods, in a limited field, in which 

 experimenters are few, which the speaker has found 

 helpful; and he hopes the telling of his experience will be 

 useful in one way or another to others. 



