62 CALIFORNIA ACADEMY OF SCIENCES. [3D Ser., 



stantly recurring zone in the cell and that it is quite easily 

 recognized. Wherever it occurs it seems to possess the 

 same characteristics as regards form, granulation, and stain- 

 ing capacity, and it appears to be a most important element 

 of the cell, probably of secretive, digestive, and assimilative 

 function. The archosome has been recognized in a great 

 number of cells and parts of it have been described under 

 several names: first, I believe, as Nebenkern; later on, 

 as microcentrum, etc. The centrosphere has been ob- 

 served in many cells and is variously termed archoplasm, 

 attraction sphere, centrosphere, etc. The somosphere has 

 been figured as surrounding the centrosomes, but previous 

 to this it has not been named nor has any function been 

 assigned it. 



