54 DAYS AND NIGHTS OF SALMON FISHING. 



liarly those of the Trout species ; so that in the absence 

 of the parent skins, which I carefully preserved, it 

 would be a matter of difficulty to determine to which 

 kind of Trout they actually belong." 



Mr. Shaw afterwards impregnated the ova of the 

 Salmon with the milt of the common River Trout, 

 according to my suggestion ; and in a letter with which 

 he favoured me, dated 26th of April, 1841, he says : — 

 " I am happy to inform you that my experiments with 

 the ova of the common Trout and Salmon have been 

 quite successful, and the young hybrids are now 

 hatched, and in good health." Mr. Shaw will, of 

 course, publish the details of his late experiments, and 

 thus add to the obligations which those who are 

 interested in this subject already owe him. 



I will only add, that his papers are written with 

 such candour, and all his experiments conducted with 

 such care and ability, and so often repeated with 

 similar results, without any effort or intention to make 

 them bend to a favourite theory, that every one, I 

 think, who reads his pages, must consider that the 

 Parr and the Salmon are of the same species, and that 

 the question is so far set at rest for ever. 



To sum up, — it appears that the young fry had burst 

 the egg 101 days after impregnation, the temperature 

 of the water being at that time 43°, and the tempera- 

 ture of the atmosphere 45° : a former brood, which 

 died and were excluded in a colder temperature, did 

 not come into life till 114 days after impregnation. 



It further appears from a part of Mr. Shaw's publi- 

 cation, which I have not hitherto quoted, but which I 



