58 REPORT ON ARTIFICIAL FISH CULTURE. 



This is so well fitted to fish hatching, especially 

 of trout and salmon, it could be easily turned 

 into a vast breeding establishment. It would be 

 only necessary to substitute for the sieve-boxes 

 hitherto used, (which offer obstructions and be- 

 come less and less permeable,) simple plates 

 placed longitudinally in parallel positions, which 

 will divide the stream into narrow drains more 

 or less numerous, through which the water. will 

 now with some degree of rapidity. These drains, 

 intended to receive the eggs, will be cut at in- 

 tervals so as to form a succession of falls, in 

 order to hasten the course and give an airing 

 to the water, and produce conditions most favor- 

 able to the end in view. Each one of these 

 drains should be extended in a meadow, without 

 being confounded with the others, and finish by 

 enlargement in a spacious basin, where the water 

 in question alone has access, and whither will 

 come the young fish when hatched, another place 

 of destination being in store for them. 



When this stream will have been so trans- 

 formed into a vast establishment made after the 

 plan I have indicated, it should be covered with 

 a glass roof like a green house, admitting the 

 light, and formed of moveable panes turning round 

 so that the air may be readily admitted when 

 deemed necessary. 



