ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 191 



is known of animal-cells where the mitochondrias also have elaborate 

 functions and form the basis of colonring matter. 



The quality of the mitochondrias in plant-cells appears to be con- 

 nected with the process of photosynthesis. S. Greves. 







B 





'■Qq 



A 



C 



Fig. VI. 



A. Epidermal cells of the white Tulii^ (living). 



B. Chondriosomes of the same cell in process of alteration. 



c. Similar cell, in which all the chondriosomes are transformed into 

 vesicles (v). 



D. Cell, fixed and stained by Regaud's method. 



E. Filaments of Saprolcgnia (living). 



F. Chrondriosomes of same in process of development. 



G. Filament in which all the chondriosomes have been transformed 



into large vesicles (v). 

 H. Filament, fixed and stained by Regaud's method. 



c, chondriosomes ; m, mitochondrias ; gg, fatty globules ; n, nucleus. 



Cell-division in the Pollen-grain of Cobsea. — W. K. Faer {Bull 

 Torr. Bot. CI, 1920, 47, 325-38). A study of the pollen-mother-cells o 



