36 DOMESTICATED TROUT. 



4th. By the old way more or less of the eggs are lost by care- 

 less feathering, exposing the eggs to the freezing atmosphere, 

 clumsiness in handling the screens (caused by cold fingers), 

 tipping of the screens, wash of the current, etc., etc. 



By the new way every egg is saved. 



5th. By the old method every fish is driven out of the race 

 when the eggs are taken. Some of them will not return, but 

 will seek a spawning-place in the pond, and many eggs will be 

 unavoidably lost. 



By the new way the fish are not driven from the race. And 

 as the boxes are always covered during the season, the fish will 

 not even be disturbed. In fact, they may spawn while the eggs 

 are being taken, and yet not a single egg be lost. 



This Spawning-Box answers for securing the naturally im- 

 pregnated eggs of salmon, salmon trout, speckled brook trout, 

 whitefish, shad, etc. It is recommended by the leading piscicul- 

 turists of the country. 



Mr. Ainsworth's idea was one of great value, and 

 Mr. Collins's device an excellent modification of it, and 

 I cordially recommend their methods to those who 

 wish to avoid the labor and exposure of taking the 

 eggs artificially. 



No one who has not had experience in taking spawn 

 by hand can conceive of the amount of labor and hard- 

 ship which this beautiful contrivance saves. There is 

 some difference of opinion as to the question which 

 yields the most eggs, the artificial or the screen method, 

 and the results of some experiments of Mr. F. Mather 

 seem to be adverse to the Ainsworth plan.* I will not 

 express an opinion here on this point, but will say that 

 the saving of exposure by the Collins Roller Box is 

 worth paying a good many eggs for. 



* See American .Agricultural Annual, 1871, p. 94. 



