APPENDIX VII. 

 EXPERIMENTS WITH TROUT EGGS AND TROUT. 



I WOULD by all means have a set of hatching boxes 

 devoted to experiments. By careful and systematic 

 experiment more knowledge and experience are gathered 

 than in any other way, and it is upon this that sound 

 progress in fish culture or any other art depends. 



The experiment boxes need not be large. Boxes vary- 

 ing in capacity from ioo to 1,000 eggs each are about the 

 right thing. They can be separate boxes or subdivisions 

 of the regular hatching troughs separated by screens ; but 

 whatever they are they should be perfectly isolated from 

 each other, for where this precaution has been neglected 

 it is a very common and provoking source of disappoint- 

 ment to have the eggs of different experiments wash in 

 together and become indistinguishable. This is just as 

 fatal, of course, to all useful results, as if the eggs had 

 been destroyed. 



The separate subdivisions should be distinctly desig- 

 nated, and full notes of the experiment carefully taken 

 down in a note-book. In brief, the experiment, to be 

 valuable, should be exact, systematic, and full in recorded 

 detail, and the experiment boxes should be prepared to 

 this end. 



Below will be found some of the experiments in trout 

 culture which most readily suggest themselves. 



