40 GERM-CELL CYCLE IN ANIMALS 
which stain with crystal violet after Benda’s method, 
and appear to be mitochondrial in nature. At a 
slightly later stage (Fig. 8, C; position C in Fig. 7) 
the nucleus is larger and contains several small 
spherical chromatic bodies besides the nucleolus. 
The cytoplasm has increased more rapidly in volume 
and a corresponding increase in the number of mito- 
chondrial granules has also taken place. Further 
growth results in an increase in the volume of both 
nucleus and cytoplasm (Fig. 8, D; position D in 
Fig. 7), and a slight increase in the number of mito- 
chondria. Whether these bodies developed de novo 
or by division of the preéxisting granules could not 
be determined. 
In succeeding stages growth is very rapid. The 
cytoplasm (Fig. 8, E; position E in Fig. 7) still 
remains homogeneous except for the mitochondria, 
which increase slightly in size and become situated 
as a rule near the periphery. The nucleus at this 
time contains a large number of chromatin granules 
and a diffuse reticulum. Part of an older odcyte 
is shown in Fig. 8, F (position F in Fig. 7); the cyto- 
plasm has assumed a reticular appearance; the 
mitochondrial granules are present in greater num- 
bers, and the nucleus is larger, oval in shape, and 
contains a distinct reticulum with many chromatin 
bodies of various sizes. A still older odcyte (Fig. 
8, G; position G in Fig. 7) is interesting particularly 
because of the rapid increase in the mitochondria and 
the localization of these near the periphery. From 
this stage on the character of the contents changes 
