1895. | NEW YORK ACADEMY OF SCIENCES. 225 
karyokinesis and with occasional spindle figures. Above this 
zone one never sees the yolk-nucleus, below it the yolk-nucleus 
can be found in all the stages of its development and disappear- 
ance. It first appears as a heap of closely aggregated granules 
at one part of the nucleus and so closely applied to the nuclear 
Fig. 1. Odgonium in the spirem stage. 
Fig. 2. Odeyte showing origin of the yolk-nucleus from the chromatin 
network. 
Fig. 3. Later stage to show position of the yolk-nucleus, fibrous prolonga- 
tions, and the beginning of disintegration. 
Fig. 4. Later stage of disintegration. 
Fig. 5. Nearly ripe egg, showing yolk plates, and disintegrated chromatin 
within the germinal vesicle. All camera drawings from sections. 
TRANSACTIONS N. Y. ACAD. Sc, Vol. XIV., Sig. 15, June 13, 1895. 
