24 



A TEXTBOOK OF THEORETICAL BOTANY 





B 



' *■ ii'' ,: 



D 



^'°' ]°-~^^^""" '^^P"- Photographs of successive stages of mitosis in cells of the root. 

 A, B, C, D, Stages of the formation of chromonemata in the prophase. E, F, 

 Chromosomes in metaphase. 



