Zool.— Vol. I.] E/SEN—PLASMOCYTES. 33 



sphere is very large, as in figs. 40, 49, $8a, 73, and 77; at 

 other times it is narrow but equally distinct, as in figs. 47 

 and 60. The darkest granules are either accumulated at 

 the margin near the hyalosphere or near the centrosphere, 

 as seen in figs. 53 and 58a, or they are concentrically dis- 

 tributed as in fig. 55. 



That the centrosphere is entirely distinct from the grano- 

 sphere is shown by its different staining quality, by its less 

 pronounced granulation, and by the frequently very sharp 

 margin which separates the two spheres. Thus in fig. 49 

 we see the centrosphere stained pink, while the granosphere 

 is dark blue. The above figure is from an eosin-methyl 

 blue preparation. In fig. 58a the centrosphere is pale 

 blue and the granosphere is dark blue. The somosphere 

 is here very pale and unstained, while the centrosomes are 

 very sharply defined. The centrosphere, more than any 

 other sphere, exhibits amoeboid movements, as seen in figs. 

 82, 83, etc. In order not to repeat I will leave the detailed 

 description of the various figures to be given at the end of 

 the paper. 



The innermost enclosures of the archosome, the somo- 

 sphere, and the centrosomes, may best be considered to- 

 gether, as they undoubtedly are very closely related 

 and are apparently dependent on each other. Sometimes 

 the centrosomes are not distinct, while at other times the 

 somosphere cannot be distinguished. Again, at times, the 

 distinction is prominent, as for instance in fig. 49, where 

 the somosphere has assumed a deep blue, while the cen- 

 trosomes of both remain dark; or, in fig. 65, where the 

 somosphere is lighter blue; but this absence of either the 

 centrosomes or somosphere is, I think, only apparent, being 

 due to imperfect staining, caused by either too long or too 

 short exposure to the stain. In all successfully stained 

 slides the somosphere and centrosomes are never absent. 

 I have frequently observed that the somosphere and centro- 

 somes do not always lie in the center of the centrosphere, 

 as in fig. 65, but at one side, as in fig. 69, or even outside 

 of it, as in fig. 73. When there are three centrosomes pres- 



