BuL. U. S. B. F., 1908. 



PI.ATE LXXXVIII. 



I'lG, 23. — Equipment of McDuiiakl automatic tidal boxes, for hatchiug cod, Boothbay Harbor, ]\Ie. Shows buxes lifted 

 out of troughs and bottom upward on farther tables. The bottom is of scrim, and by means of cleats is held 1% 

 inches above the bottom of the trough at the center. By an arrangement of partitions at the head of the trough 

 the eggs receive the supply of water through the scrim bottoms of the boxes, also through a small hole in one end 

 of the box. The distinctive feature of the apparatus, whence it is called "tidal." is the automatic siphon outflow, 

 by means of which the water is alternately drawn down and replenished. Standpipe witli siphon cap is shown in 

 near troughs; waste trough below. 



Fig. 24.- 



-Berried lobsters, taken from pound at lioothbav Ilarbur station (Maine), iu course of transfer to wells of the 

 steamer which is to convey them to the hatchery for stripping. 



