Zool.— Vol. I.] EISEh'—PLASMOCYTES. 39 



Here we have seven or eight distinct spheres instead of six. 

 Perhaps the simplest way to explain this is to suppose that 

 the centrosphere, which here is pale blue, has accepted 

 some food, or some other unusual substance which has so 

 arranged itself that it cuts the centrosphere in two. How- 

 ever, this explanation is given for what it is worth, without 

 any pretence to correctness. Every cytologist knows that 

 now and then cells of various kinds are met with which pre- 

 sent an abnormal structure not readily explainable. Another 

 abnormal plasmocyte is one shown in fig. 77. Here the 

 centrosphere appears as a broad band across the grano- 

 spheroplasm. The darker margin of the band with the 

 four black dots I consider to be somosphere and centro- 

 somes. 



As to the nature of the various black dots in fig. 56 I am 

 undecided; they may be centrosomes or not. I think the 

 three larger ones certainly are centrosomes, each surrounded 

 by somosphere and centrosphere. The centrosphere of the 

 one to the right is very large, extending across the center of 

 the plasmocyte. 



Amoeboid Movements. — The amoeboid movements of the 

 frayed ends of the fusiform corpuscles were mentioned by 

 MacCallum, and have probably been observed by some in- 

 vestigators of the large elements of batrachian blood. 

 MacCallum, however, speaks of the slow vibratory motion 

 of the starlike prolongations, and not of regular amoeboid 

 movements or projections, though from the general tone of 

 his arguments (pages 245, 246) it would, I think, appear as 

 though he considered the amceboid movements as really 

 existing. This movement has been denied by Eberth, 

 who holds that under ordinary circumstances such move- 

 ments do not exist, at least not in the fusiform cor- 

 puscles; but I have frequently observed plasmocytes and 

 have satisfied myself that in them such movements are 

 common, generally very slow, but under certain condi- 

 tions extremely rapid. If a drop of blood is mixed with 

 salt solution of 0.6, we see that the plasmaprojections 

 change rapidly, pushing out with unusual vigor to a greater 



