SALMON. 29 



directed a small stream of water from the river two inches 

 deep. At the end of this trench, I placed an earthenware 

 basin of considerable size, for the purpose of ultimately re- 

 ceiving the ova. I then, at one and the same instant, en- 

 closed both the fish in the hoop, allowing them to find their 

 way into the bag of the net by the aid of the stream. In 

 capturing these fish, I considered myself fortunate in secur- 

 ing them by one cast of the net, for, in conducting the expe- 

 riment of artificial impregnation, it appeared to me to be very 

 desirable that the male should be taken, with the female of 

 his own selection, at the very moment when they were mu- 

 tually engaged in the continuance of their species. To take 

 a female from one part of the stream and a male from an- 

 other, might not have given the same chance of a successful 

 issue to the experiment. Having drawn the fish ashore, I 

 placed the female, while still alive, in the trench, and pressed 

 from her body a quantity of ova. I then placed the male 

 in the same situation, pressing from his body a quantity of 

 milt, which, passing down the stream, thoroughly impregnated 

 the ova. I then transferred the spawn to the basin, and 

 deposited it in a stream connected with a pond previously 

 formed for its reception. The temperature of this stream 

 was 39, of the river from which the Salmon were taken 

 33, and of the atmosphere 3b'. The skins of the parent 

 Salmon are now in my possession. 



" On examining the ova on the 23rd of February (fifty 

 days after impregnation), I found the embryo fish distinctly 

 visible to the naked eye, and even exhibiting some sym- 

 ptoms of vitality by moving feebly in the egg. The tempera- 

 ture of the stream was at this time 36, and of the atmo- 

 sphere 38. On the 28th of April (one hundred and four- 

 teen days after impregnation), I found the young Salmon 

 excluded from the egg, which was not the case when I visited 



