100 



al motion of the water is strong enough to carry the 

 shells over the outlet, and it is manifest that by such an 

 arrangement no sediment can at any time collect on the 

 eggs. It was feared at first that the continual motion 

 might wear through the shells. It has been used with 

 trout, and is the proper arrangement if shad eggs are to 

 be hatched in the Holton box, as for them trays are not 

 necessary. If salmon or trout eggs are to be treated, a 

 much smaller number must be put in each box, than 

 it they were distributed on the trays. The original 

 arrangement of the boxes is the best for general purposes, 

 and these modifications, are only mentioned in case they 

 should fit peculiar circumstances. 



Glass Tbats. — It seems hardly necessary to refer to 

 trays which have small glass tubes instead of wire net-' 

 ting on the bottom. These were among the first plans 

 tried and will answer very well. But they are expen- 

 sive to make and easy to break, while they are no better 

 than our cheaper and stronger trays. 



OuE Peacticb. — A number of other arrangements 

 could be detailed, but these are the best, and cover all 

 conceivable circumstances. We have given so many 

 that perhaps we had better state exactly what course we 

 follow as the best, simplest, cheapest, easiest and most 

 certain. We hatch whitefish in the Holton box, com- 

 pleting the operation there and allowing the fish to break 

 their eggs, to work their way up through the wires, and 

 paSs over the upper rim into a reservoir, the egg shells 

 going over at the same time. We have given up trying 

 to feed whitefish and distribute them at once to the 

 lakes they are to inhabit by depositing them in the 

 water suitable for them. 



Brook- trout, salmon- trout and salmon eggs we develop" 

 in the Holton boxes till they are about to burst their 



