Embryology. 131 
Fic. 37.—Study of successive changes taking place in the nucleus of an epithelium- 
cell, preparatory to division of the cell. (From Quain’s Anatomy, after Flem- 
ming.) a, resting cell, showing the nuclear network ; 4, first stage of division, 
the chromatoplasm transformed into a skein of closely contorted filaments; cto f, 
further stages in the growth and looping arrangement of the filaments ; g, stellate 
phase, or aster; 2, completion of the splitting of the filaments, already begun in 
fand g; 2, 7, 2, successive stages in separation of the filaments into two groups ; 
Z, the final result of this (diaster) ; m to g, stages in the division of the whole 
cell into two, showing increasing contortion of the filaments, until they reach the 
resting stage at g. 
K 2 
