512 



INDEX. 



Vocal sac, 9, 51 ; ligament, 21 

 Vorticella, 359, 368 



W. 



Wood, 446, 454, 4631 47 2 

 Wood-cells, 473 



X. 



Xii-histernum, 69 



Xylem, Bean, 463, 464, 473; 



Fern, 446, 448, 449, 454 

 Xylem-parenchyma, 455 



Yeast, 377 — 388 

 Yellow-brown tissue (vide Chlora- 

 gogen cells) 



Z. 



ZONITES, 241, 248 



Zoochlorella (vide Chlorelloids) 

 Zoogloea, 409, 412 

 Zoospores, 391, 393 

 Zygapophyses, 56 

 Zygospore, Mucor, 423 ; Spiro- 

 gyra, 401, 407 



CAMBRIDGE : PRINTED BY C J. CLAY, M.A. AND SONS, AT THE UNIVERSITY PRESS. 



