94 



Maynard M. Metcalf on the 



After having examined several hundred blastomeres, all 

 showing the intra-protoph^smic bodies under discussion, I 

 have selected a single blastomere to figure and describe, not 

 because there are not many others showing a similar con- 

 dition, but because this seems sufficient to establish the point. 



'i'he blastomere figured is one of five appearing in a section 

 of an embryo of 8. hexagona at that stage of development 

 when the follicular epithelium of one half the surface of the 

 embryo is most rapidly proliferating — about the stage shown 

 in Brooks's fig. 2, pi. xi. The arrow indicates the direction 

 of movement of the follicle-cells as they wander into the 



Wkt^^ 



Portion of & section of a youn<r embryo of Sal/a hexagona,, slidv iiip- one 



blastomere and tiftoen mifrratcd follicle-cells. 



i?/=blaslonieie ; iV=nucleiis of blastomore ; a, h, c, d, e,f, y, h, ;, A = 



nuclei of fcillide-cells ingested by the blastomere. 



centre of the embryo, where, as described by Brooks, many 

 of them degenerate. The figure is carefull}' drawn with a 

 Leitz ^., immersion objective and a number 8 compensating 

 ocular. 



The large blastomere, Bl^ lias a very large nucleus, N, and 

 evenly granular })rotoplasm, which does not stain deeply with 



