290 AMERICAN FISH CULTURE. 



" Thirdly, it will save all the parent trout in health, 

 whereas, in artificial impregnation it kills some by constant 

 handling ; 



" Fourthly, the young will be more perfect, stronger, and 

 healthier, from the perfectly mature spawn ; 



" Fifthly, the trout cannot get at the spawn to eat them ; 



" Sixthly, it saves a world of care and watching. 



" These screens can be placed in any stream, and the 

 spawn is taken in perfection. They will handle best the 

 width of the wire cloth, and the length the width of the 

 race, with handles at the ends.'' 



XIII. 

 CRUSTACEA. 



The following, extracts from " The Harvest of the Sea," 

 will give some idea of the immense number of Crustacea 

 consumed by the people of London, as well as an insight 

 of the natural history of some of the members of this class 

 of animals. I am not aware of any statistical information 

 having been furnished of the amount of this kind of food, 

 in the United States, but the number of lobsters consumed 

 east of New- York must be immense. 



Crabs are more commonly eaten south of that city along 

 the whole extent of our coast, and are generally considered 

 a delicacy, soft crabs particularly so. Crabs are found in 

 immense nutabers in the shoal waters of the southern sea- 

 board states. In some of the creeks on the Chesapeake 

 Bay, I have seen them so numerous that some thousands 

 might have been counted on the area of a single rod of the 



