85 



Or bene, queste due masse polari protoplasmatiche sono quelle che 

 I'EiSEN chiama plasmoblasti : „The fusiform corpuscle 

 consists of the nucleus and oneortwoplasmocytoblasts, 

 each one of which consists of six cytoplasmic zones, 

 including centro somes" (p. 59, 7). E queste zone sono da lui 

 dette : I*' plasmosfera, 2^ ialosfera, 3" granosfera compo- 

 nenti cio che egli chiama il citosom a ; 4" centrosfera, 5^ somo- 

 sfera, 6^ centrosoma costituenti I'archosoma. 



„The plasmocytoblast is capable of development 

 and division into two, three or more plasmocytes, 

 which finally separate from the nuclear vicinity, each 

 one forming a free and independent active plasmocyte 

 in the blood serum" (p. 60, 8), 



„The plasmocyte undoubtedly survives in this state 

 for a considerable length of time and must take rank 

 with the other principal and active corpuscles in the 

 blood, the erythrocytes and leucocyte" (p. 60, 9). 



„The plasmocyte is capable of growth through as- 

 similation of food and exhibits phagocytosis. It con- 

 tains the same cytoplasmic zones as are found in the 

 plasmocytoblast, but has no nucleus" (p. 60, 10). 



„The determining part of the plasmocyte is the ar- 

 chosome, or centrosomes with spheres, as without them 

 the plasmocyte is not formed. Imperfect plasmocyto- 

 blasts, or such as do not possess an archosome, do not 

 develop plasmocytes" (p. 60, 11). 



„The nucleus of the fusiform corpuscle goes quickly 

 to decay, no part of it surviving in the plasmocyte" 

 (p. 60, 13). 



„The archosome is not merely an organ in the cell — 

 a large microsome formed for the special purpose of 

 mitosis — but constitutes a most important element of 

 it, the very center of organization, equal in importance 

 to the nucleus itself" (p. 60, 14). 



„Thesurvival of the archosome, with its phenomena 

 of growth and phagocytosis, and its general independ- 

 ance, suggest a symbiosis between the archosome, the 

 caryosome, and the cytosome" (p. 60, 15). 



„The new plasmocyte in the blood of Batrachoseps 

 may then be defined as acorpuscle, generally without a 

 cell wall, and always without a nucleus: but consisting 

 of the archosome, whichhas surrounded itself with the 



