148 



PART II. VEGETABLE HISTOLOGY. 



to divide again, as is evidenced by the fact that the nucleoli 

 have already divided. 



In most cases of cell fission, the nucleus appears to play an 

 important part, the progressive changes through which it passes, 

 just previous to the formation of the membranous separating 

 partition, being exceedingly complicated and interesting. Some 

 of the successive stages in these changes, as they occur in the 



Fig. 392. — Tradescantia Virginica. Process of division in the cells of the stamina] 

 hairs, a, terminal portion of filament with three cells, the lower with a resting nucleu.s 

 upper two cells have just been formed by division, b, cell with coarsely granular nu 

 preparing for division, c to /, successive stages of division followed in the same cell, 

 nified 540 times. After Strasburger. 



hairs taken from the young filaments of Tradescantia Virginica 

 are illustrated in Fig. 392. The illustrations are taken from 

 Strasburger. In some plants, however, as in Cladophora glom- 

 erata, a common fresh-water alga, where the cells, when mature, 

 are multinuclear, the nuclei increasing by division within the 



