U. S. B. F.—Doc. 912, 
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LONGITUDINAL SECTION AOSS SECTION LONGITUDINAL SECTION CROSS SECTION © - 
THROUGH SUPPLY TROUGH THOUGH SUPPLY TROUGH THROUGH DRAIN TROUGH THROUGH DRAIN TROUGH AT JOINT B 
i DRAIN TROUGH ey. . 
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Fic, 1.—Plar of hatching battery in use at the Cape Vincent (N. Y.) station for the incubation of whitefish and cisco eggs. (Designed by J. P. Snyder.) 
