228 



BULLETIN OF THE UNITED STATES FISH COMMISSION. 



superintendence a suitable allowance is made for the maintenance of the older fish, 

 and the balance is charged to the fry. By this method we arrive at the following 

 results: 



Cost. 



Food 



Attendance 



Superintendence 



Total 



Applied to the rearing operations of 1891, a similar calculation gives us this 

 result: The fry that were carried through the season from June to October, inclusive, 

 cost, for food, attendance, and superintendence, $0.0081 each; that is, about four-fifths 

 of a cent each for the term of five mouths. 



