1892.] Heredity and the Germ- Cells. 645 
Japanese student of Clark University, figures representing the 
high differentiation of the cell-contents during division (figs. 
8,9). They bring out the active and passive elements of the 
typical cell. 
The phenomena of karyoka which attend the division 
and distribution of the hereditary substance throughout the 
whole course of embryonic and adult development are well 
illustrated in Carnoy’s figures (fig. 7). First we have the qui- 
Fic. 8. ibd Diviston. DIFFERENTIATION OF THE CYTOPLASM AND Nuc revs DURING 
CeLL Drviston oF a Squip Emsryo, etek (After Watase.) M, The nuclear membrane 
F, porcaisnees or TET C, Cytoplasm, or protoplasm outside of the nucleus; A-A, The two 
cen of archoplas un eens nuclear ——— filaments, E, Intra-nuclear archoplas- 
escent ona which the chromatin presents the appearance 
of a coiled, tangled thread; surrounding this is the clear 
nucleoplasm (or achromatin) bounded by the nuclear mem- 
brane; the extra-nuclear substance, or cytoplasm, is apparently 
undifferentiated. As soon as cell division sets in, however, 
radiating lines are seen in the cytoplasm above and below the 
