288 ' DOMESTICATED TROUT. 



Glass grilles for hatching 100,000 eggs cost, say 80 at 



1 3.50 apiece . ^280 



Carbonized troughs for hatching 100,000 eggs cost for 



Lumber and labor ^15 



Right to use 25 



Total cost 40 



Balance in favor of charcoal troughs .... $240 



This is an important saving of money ; but there is a 

 still greater saving in the lives of the young fish after they 

 are hatched. 



These considerations lead me to think that for business 

 the carbonized troughs stand the test better than anything 

 in use. I will only add that the work of preparing the 

 carbonized lining to the trough is very trifling, and can be 

 done in a few moments and at an insignificant expense. 



