REPORT ON ARTIFICIAL FISH-CULTURE. 45 



book upon his method of stocking streams, and 

 it seems that a society is about to be formed 

 under the patronage of Sir H. Labouchere, with 

 a view of attempting to stock the Thames with 

 salmon. 



The process employed by Gehin and Remy is 

 simple and easily practised; it hardly differs 

 from that adopted by Boccius, and equally re- 

 sembles the method described by Jacobi, nearly 

 a century ago. 



Trout-breeding takes place in December, and 

 in order to have eggs for artificial hatching, it 

 suffices to press lightly, before and behind, the 

 abdomen of a female fish ready to hatch; and 

 her eggs, in falling, should be caught in a vessel 

 with water, and afterwards sprinkled with mitt 

 obtained in the same manner and diluted. 



If the eggs have not arrived at their term 

 when operations are commenced, they will only 

 be run out with a strong pressure, and in such 

 case the fish should be left in a preserve during 

 some days before this forced birth is adopted, 

 for neither the eggs nor the milt can be usefully 

 employed in a state of immaturity, and the life 

 of the parent fish would be endangered by rough 

 handling. 



On coming in contact with the spermatised 

 water, the eggs change color before fecundation 



