12 



INDEX. 



Vocal sac, 9, 51 ; ligament, 21 

 Vorticdla, 359, 368 



W. 



Wood, 446, 454, 463, 472 

 Wood-cells, 473 



X. 



XirinSTERNUM, 69 



Xylem, Bean, 463, 464, 473; 



Fern, 446, 448, 449, 454 

 Xy]em-j)arenchyma, 455 



Veast, 377—388 



\ ellow-brown tissue, 242, 243, i^i 



Z. 



ZONITES, 241, 248 

 Zoogloea, 409, 412 

 Zoospores, 391, 393 

 Zygapophyses, 56 

 Zygospore, Mucor, 423 ; Spiro- 

 gyra, 40 1, 407 



i 



< AMHKMUUb : »'RINTEU llY C. J. CLAV, M.A. AND SONS, AT THE CNIVERSITY FKESS. 



