1 



interest to iv , fe / fi ;ures illus 



Fig. l , Pi. I, represents the sharply off bias to- 

 clisc resting on th , It shows 



ters of blastodisc, " disque huileux ". yolk sphere, and 

 egg membrane. Fig, 28, ?i, II, is from a central section of 

 a germ disc five hours old. The concentration of pro to 

 is not, yet perfect. As best I ca out all has not 



yet emerged from the central yolk, line marks 



off a region where pr ; _ _ so closely inter- 



mingled as to be indistinguisha . , ;r f '72, . . 

 17 ) fj .e scribes - out , 



L.I I, shows a degenerating blastodisc ten hours 

 and t. . structures ar |.uent 



in unfertilis: . in the foutr- to six- 



teen-celled stages, in ages from feight to twelv 

 They ■ - - . i about ten 



hours, and I am incline I to think, are of fairly rt; 

 occurrence in degenerating blastodiscs of unfertilised t . . 



Strieker in 1865) aescribed what he called an entir 

 new mode of cell formation in the blastoderm of the Brook 

 Trout, i_. _e,, a budding off of cel^s, which he thou 



. activities of the protoplasm, 

 figures show bias. one to tw " uds" 



