86 SALMON [Dl. 



ensure success. During the day, the larger sized fish move 

 but little from their accustomed haunts ; but towards evening 

 and during the night they rove in search of small fish, 

 insects, and their various larvse, upon which they feed with 

 eagerness. The young Trout fry may be seen throughout 

 the day sporting on the shallow gravelly scours of the 

 stream, where the want of sufficient depth of water, or the 

 greater caution of larger and older fish, prevent their ap- 

 pearance. 



Though vigilant and cautious in the extreme, the Trout 

 is also bold and active. A Pike and a Trout put into a 

 confined place together had several battles for a particular 

 spot, but the Trout was eventually the master. 



The season of spawning with the Trout is generally in 

 the month of October, at which period the under jaw of the 

 old male exhibits in a smaller degree the elongation and 

 curvature observed to obtain in the male Salmon, of which 

 an instance will be shown. 



Sir Humphrey Davy in his Salmonia particularly alludes 

 to the experiments of Mr. Jacobs, a German gentleman, on 

 the breeding of Trout by artificial impregnation of the ova. 

 The Rev. Dr. Walker, Professor of Natural History in the 

 University of Edinburgh, thus refers to the experiments of 

 Mr. Jacobs in his paper printed in the second volume of the 

 Transactions of the Highland Society. " He found that in 

 Salmon and Trouts the roe is not fecundated till after ejec- 

 tion. That when both are extracted from dead fishes, the 

 roe by mixture can be fecundated by the milt, and when 

 placed under water in a proper situation can be brought forth 

 into life. He further discovered that this artificial fecunda- 

 tion can be accomplished with the roe and milt of fishes that 

 have been dead two and even three days." 



By the kindness of Mr. Pickering, of Chancery Lane, I 

 am enabled to insert here a translation of Mr. Jacobs' paper, 



