i8 



Heredity and Environment 



sizes, come out of a nucleus at the time of division as went into 

 it at the preceding mitosis, each new chromosome coming out of a 

 chromosomal vesicle (Fig. 8, A, B, C). Whenever one can trace 

 individual chromosomes or chromosomal vesicles through the 



E 



Figs. 6, 7. Diagrams of Successive Stages in the Division of a Cell by 

 Mitosis. A, Cell with "resting" nucleus and centrosome (c) ; B-E, Early 

 stages of division during which the chromatin takes the form of short 

 thick threads, the chromosomes (C, D, E) while the centrosome gives 



