30 SALMON FISHING IN THE TWEED 



skins of the parent salmon were kept, and may be 

 seen at any time. 



On the 28th of April, 114 days after impregna- 

 tion, the young salmon were excluded from the egg, 

 which was not the case when they were visited the 

 preceding day. On the 24th of May, twenty-seven 

 days after being hatched, the young fish had con- 

 sumed the yolk which remains attached to the 

 lower part of the body, and which serves him for 

 nourishment, and the characteristic bai~s of the parr 

 had become distinctly visible. From a deposition of 

 mud, as Mr. Shaw apprehends, all these fry, except 

 one individual, were found dead at the bottom of 

 the ponds, so that there was no opportunity of 

 watching their future progress ; but an ingenious 

 experiment was made, which proved that an in- 

 creased temperature hastened the development of 

 the infant fish. 



But we shall see that Mr. Shaw was too in- 

 defatigable to be daunted by such an untoward 

 accident, and that he persevered in his experiments, 

 till his efforts were rewarded by complete success. 



On the 27th of January, 1837, he captured a 

 male fish of sixteen pounds, and a female of eight, 

 and expressed the ova of the female and im- 

 pregnated it with the milt of the male in the 

 manner above related, and deposited the spawn in 

 this state in a private pond as before, and to which 

 no fish could by possibility have access. 



" On the 21st of March," says Mr. Shaw (that is, 

 fifty-four days after impregnation), "the embryo 

 fish were visible to the naked eye. On the 7th of 

 May (101 days after impregnation), they had burst 



