APPENDIX I. 28l 



any other young fish that I had. I have accordingly come 

 to the conclusion that salt is beneficial to the young fish, 

 and that large quantities can be used to advantage in the 

 nurseries of the young fry, not only for the purpose of im- 

 mersion, but to furnish an essential element in which the 

 water has become deficient. All spring water, it is said, 

 contains a modicum of salt. Perhaps this slight trace of 

 salt is essential to the health of the fish. If so, then salt 

 ought to be supplied artificially when trout are kept in a 

 spring stream where the supply of salt is insufficient. 



