58 THE NEW ART OF BREEDING FISH. 



ceived in a tub or tank, may be employed again and 

 again, provided it is freed from impurities each time 

 by passing through a filter in the fountain. 



If one has neither a greenhouse, orangery, nor 

 coach-house, in which to put up such an apparatus 

 as I have described, and it is desired to hatch eggs 

 in a natural streamlet, it may be done by procuring 

 willow hurdles or large flat baskets resembling the 

 one in the engraving {plate l,fig- 4). This basket 

 should be so fastened to the bank that its top should 

 be a little below the surface of the water. The fe- 

 cundated eggs should then be spread over the bottom, 

 either upon the willow or upon living aquatic herbs 

 covering the bottom. 



A willow lid {plate 2, Jig. 4 a), or any other suita- 

 ble cover, should then be fitted to this basket, which 

 will protect the eggs and young fry from their natu- 

 ral enemies and destroyers, and this done, the 

 hatching will take place without any further super- 

 vision. 



If in the locality where the experiment is to be 

 tried, there are not at hand either willow hurdles or 

 baskets, or the means of making them, recourse may 

 be had to shallow wooden tubs, pierced with a num- 

 ber of holes, covered with wire grating, through 

 which the water may freely flow over their contents. 

 The eggs being placed in them, the tubs should be 

 secured near the surface of the stream. 



One of the chief difficulties in the way of natu- 

 ral reproduction is the absence from most streams of 



