Zool.— Vol. I.] 



RISEN— PLASMOCYTES. 



*9 



SOMOSPHERE 

 CENTROSOME 



PLASMOSPHERE. 



Hyalosphere. 



Granosphere. 



Centrosphere. 



Diagram 2. Plasmocyte from the blood of Batrachoseps attenuates . 



In this diagram the spheres have the same value as in the 

 former, the only difference being that they have assumed a 

 spherical form. This is a diagram of such a plasmocyto- 

 blast as that represented by figs. 25a, 39, etc., while dia- 

 gram 1 represents such a plasmocytoblast as is seen in fig. 

 21. 



Before I enter into a more minute description of the re- 

 spective spheres, a few words about their general appear- 

 ance may facilitate our understanding of them. In general 

 the effect of the toluidine stain is as follows : The plasmo- 

 sphere stains faintly blue, with darker blue blotches along 

 the outer margin; the hyalosphere remains nearly always 

 pure white, only staining faintly red with eosin, while 

 with rubin it seldom differentiates; the centrosphere ap- 

 pears strongly granulated and stains deeply violet; the 

 centrosphere stains pale blue or deep violet with toluidine, 

 with eosin it stains deep pink; the somosphere stains 

 generally dark, with darker centrosomes. The exceptions 

 to this general rule will be noted further on. Fig. 21 

 represents a fusiform corpuscle in which the conelike 

 plasmocytoblast is especially prominent at the upper pole, 

 while at the lower pole it is much smaller, and probably 



