Fig. 3.7 — Allium root cells treated with colchicine. A. Cruciform c-pairs associated around 

 the spindle substance. At bottom of group one pair is completely separated in c-ana- 

 phase. The timing of separation is upset as well as delayed. B. C-pairs with arms fully 

 repulsed. A light, unstained area surrounds the chromosome. C. Chromosome reverting 

 to interphase; dechromatization has occurred. Chromosomal framework associated with 

 the central substance. D. An amoeboid restitution nucleus around the pseudospindle or 

 achromatic sphere. The end of at least one c-mitosis. (Photomicrographs furnished by 

 courtesy of Dr. C. A. Berger, Fordham University, N. Y. After Berger and Witkus, 1943) 



