MR. HOGG ON THE MODES, ETC. 73 



V. — On the Distribution of Certain Species of Fresh-water Fish ; 

 and on the Modes of Fecundating the Ova of the Salmonidce. 

 By John Hogg, Esq., M.A., F.R.S., F.L.S., &c. 



(Bead, February 21, 1856.) 



The distribution of species of fresh-water fish, particularly of 

 the Salmonidce y as well as the methods of fecundating their ova, 

 having for a few years past, at intervals, engaged my attention, 

 I propose to show, in the following pages, by giving some extracts 

 from two unpublished papers, which I read before the Linngean 

 Society, on these interesting subjects, three or four years ago, 

 what I had then written, and what another author has still 

 more recently made known to other scientific societies with 

 regard to them. 



Th& first of these subjects early attracted my notice; indeed, it 

 was in the summer of 1824, when making an extensive tour in 

 Switzerland, that the presence of the beautiful pink trouts, or 

 probably ChaiT — the Salmo Umhla, and perhaps also the S. Al- 

 pinus (if not identical) — in the small lakes or tarns in the Alps, 

 struck me not only as a fact of remarkable interest, but also as a 

 problem in the economy of Nature very difficult to be solved in 

 a satisfactory manner. 



Again, on reading, in 1850, Mr. Weld's amusing little book on 

 " Auvergne, Piedmont, and Savoy," this passage revived the same 

 idea. " The Lac de Guery (near Mont Dore in Auvergne) is 

 situated in the centre of a plateau, about 4,000 feet above the 

 sea-level. It is startling, at such an elevation, to see so large a 

 piece of water. It occupies the crater of a volcano." .... 

 *' How trout got into these waters is not so easily explained; 

 suffice it for our present purposes that they are there." (P. 123.) 



In my paper, entitled — " On the Artificial Breeding of Salmon, 

 and the Distribution of Certain Species of Fresh-water Fish," 

 which I read to the Linnsean Society, on May 4th, 1852, 1 observed 

 as follows : — "And indeed, connected with the present subject, is 

 one which I do not think has received sufficient attention from 

 Naturalists — or, at least, as far as I am aware, has it been fully 



