U. S. B. F, — Doc. 949. 



Fig. 7. — Unfertilized whiteflsh egg 24 hours old. 



Fig. 8.— Fertilized whitefish egg 6 hoius old, germinal 

 dislvs forming, no segmentation having taken 

 place. 



Fig. 9.— Whitefish egg, 12 hours, showing first cleav- Fig. 10.— Wliiteflsh egg, eighteenth horn-, water 38°, 

 age, water 38°. showing second segmentation, four cells formed. 



Fig. 11.— Whitefish egg, 24 hours, water 3S°. Fig. 12.— Whitefish egg, 48 hours, water 38° 



DEVELOPMENT OF THE WHITEFISH EMBRYO. 



