512 INDEX. 



Vocal sac, 9, 51 ; ligament, 21 

 Vorticella, 359, 368 



W. 



Wood, 446, 454, 463, 472 

 Wood-cells, 473 



X. 



XiPHISTERNUM, 69 



Xylem, Bean, 463, 464, 

 Fern, 446, 448, 449, 454 

 Xylem-parenchyma, 455 



Y. 



Yeast, 377—388 



Yellow-brown tissue, 242, 243, 267 



Z. 



473 



ZONITES, 241, 248 



Zoogloea, 409, 412 

 Zoospores, 391, 393 

 Zygapophyses, 56 

 Zygospore, Mucor, 

 gyra, 401, 407 



423; Spiro- 



CAMBRIDGE : PRINTED BY C. J. CLrAY, M.A. AND SONS, AT THE UNIVERSITY PKBSS. 



