INTRODUCTION. 15 



depopulated by the untiring zeal of the angler, 

 can be replenished with little trouble and at a 

 small expense. Such streams as are not suited 

 to the trout can be stocked with other choice 

 varieties of fish with the same ease. 



The number of eggs produced by a single 

 female trout in one season has been variously 

 stated by different writers, but it is a moderate 

 statement to say that it is many hundreds. 



A word to those who wish to make the 

 experiment, and I have done. The attempt 

 should only be made when the eggs are mature ; 

 to be secure in this, it will be best for the 

 beginner to take the parent fish when they 

 are engaged in depositing the eggs. After the 

 eggs are forced into the vessel containing the 

 water, they should be stirred about a little, the 

 water poured off, and the vessel filled again 

 before the spermatic fluid is added, after which 

 the water should be a second time agitated, in 

 order that it may come in contact with all the 

 eggs; this is necessary to the impregnation of 

 all of them. They should then be placed 

 where they can have running water passing con- 

 stantly over them. This may be done by hav- 

 ing a series of boxes partly filled with coarse 

 sand and gravel, each placed below the other 

 in the form of a stairway, the water passing 



