32 FISH CULTURE. 



CHAPTEE II. 



ON THE ARTIFICIAL HATCHING OF SPAWN. 



To give the reader a clear guide to the artificial 

 hatching of fish spawn, it is necessary that I should 

 describe the operations from first to last, and the 

 means employed; and as perhaps the best way will 

 be to describe minutely some particular set of opera- 

 tions, I shall take those of the Thames Angling 

 Preservation Society, which were carried on imme- 

 diately under my eye from first to last, as I had 

 access at all hours to the apparatus. The opera- 

 tions consisted of two series or phases, applicable to 

 almost any fishery, one of them being conducted 

 out of doors and the other under glass. 



I have always been an advocate for increasing 

 largely the stock of trout in the Thames, and for 

 the introduction of greyling into that river ; and, 

 some years ago, I touched upon the latter subject in 

 the Field, and advised that it should be taken up. 

 It was slightly discussed at the time and dropped. 

 But I did not lose sight of the matter, and about 



