AETIFICIAL NESTS. 83 



the fish in a net, we take the eggs from her,* 

 "we treat them in the manner which was first 

 discovered by two poor fishermen (honour to 

 their memory) and afterwards developed by 

 M. Coste, professor of embryology at Paris, 

 and we place them in an artificial nest, such 

 as I will endeavour to explain to you. 



In the first place, you must provide an 

 artificial nest, and, in the second, an artificial 

 mother. Now the former consists of gravel 

 placed in a narrow box, either of wood, 

 earthenware, or zinc ; the latter consists of a 

 stream of shallow water, which shall be run- 

 ning day and night. 



For hatching on a large scale I recommend 

 you to procure boxes such as this — a model of 



* The manner of doing this is fully detailed at the end of 

 the book, for the benefit of those who wish to perform the 

 operation. 



