Plate VIT. 



Fig. 1 -Rearing plant viewed from the east side. The four rearing or hatching boxes have been 

 litted outof the water. Side windows, 4 feet by 1 foot, are shown at the sides. Mr. Dawson 

 IS holding one of the paddles upright. The engine house is in the background 



Fig. 2. 



-Rearing plant viewed from the east side. One of the rearing boxes is shown immersed in 

 the water, and Mr. Dawson in the act of feeding the larvie. 



