THE NEW AET OF BREEDING FISH. 51 



only to be found in an establishment designed for the 

 business. For general use and ready application I 

 recommend therefore, the process described at the 

 commencement of this chapter. 



The milt of a single male will suffice to fecun- 

 date the eggs of a large number of females, provided 

 he is fed while in the pond or tank, and that care is 

 taken not to take him from the brook and shut him 

 up there until his milt is fully matured. Of this 

 fact the author of the memoir published by the 

 Count de Groldstein was aware, and I have often had 

 occasion to verify it while on board the boat of the 

 fisherman Glasser, at Bale, where the male salmon 

 and trout emptied one day to fecundate the eggs 

 destined for the government establishment at Hun- 

 ingen, are found gorged the next, and so on every 

 day, for the five or six during which their organs 

 secrete semen. It is not necessary, therefore, in 

 experimenting on a large scale, io have numerous 

 males, but only that they should be in the condition 

 I have indicated. 



CROSSING BREEDS. 



Artificial fecundation gives the means of obtain- 

 ing, by crossing breeds, mongrels having the quali- 

 ties of the parents of the two kinds crossed. It 

 will be curious to note aU the results from experi- 

 ments of this nature. At present we know that 

 trout and salmon can be crossed. Trout's eggs 



