BULLETIN OF THE UNITED STATES FISH COMMISSION. 185 



In the use of this apparatus I found that a fair separation could be 

 effected, but to accomplish this required perfect stabili fcy of the vessel 



Fig. 1. — Original form of apparatus employed in the experiments. Used May, 1881, on the Potomac 

 barges. 



aud careful manipulation. When the barges were lying quietly on the 

 water, and there was no tide swell in the river, the separation went on 

 perfectly, the dead eggs being continually thrown off from the mass of 

 living eggs and swept by the current over into the exit trough and car- 



Fig. 2.— An alternate form, used in the spring of 1881. 



ried off from the apparatus. The slightest oscillation, however, of the 

 barge, produced by waves, would derange the orderly movements of the 



