KEIMBAHN-DETERMINANTS 221 
of the cast-out chromatin, and there is consequently 
no grounds for the hypothesis that “‘in Ascaris those 
cells which become body cells are the ones that in- 
clude the cast-off chromosome ends in their cyto- 
plasm, and it will probably be found that these 
ejected chromosome parts engender such cytoplasmic 
differentiations as characterize the body cells” 
(Montgomery, 1911, p. 192). 
Curomipia. To several of the bodies listed in 
the table on page 88 as keimbahn-determinants has 
been ascribed an origin from the chromatin of 
the germinal vesicle. Many cases of the elimination 
of chromatin from the nuclei of growing odcytes are 
to be found in the literature. Blochmann (1886) dis- 
covered a process of “budding” in the odcytes of 
Camponotus ligniperda resulting in the formation 
of ‘‘Nebenkerne.” These appear first as small 
vacuoles lying near the nucleus; later they contain 
small staining granules and acquire a membrane. 
The “‘Nebenkerne”’ grow in size and increase in num- 
ber, while the nucleus of the odcyte becomes smaller. 
Stuhlmann (1886) described a similar phenomenon 
in about a dozen different species of HYMENOPTERA. 
The odcyte nucleus in all species examined becomes 
localized near the anterior end; then the small 
nuclear-like bodies form around it at its expense. 
The time of their production varies in the different 
species; in some they appear in the very young 
eggs; in others not until a much later stage has been 
reached. Sometimes’ they fuse to form a large 
““Dotterkern”’ lying at the posterior pole of the egg ; 
