INDEX 



\'olvocales, 15. 

 Volvox, 18, ig. 



Wastes, 412. 



Water, ascent, 34g ; capillary ascent, 314 ; 

 continuity, 301 ; and death, 483 ; entry, 

 316; exudation, 332; immigration, 308; 

 influx, 32s ; loss, 331 ; migration into roots, 

 314 ; movement, 341 ; and plants, 299, 

 311; raw material, 366; relations, 301; 

 soil, 313 ; solvent, 303. 



Water ferns, 170. 



Water molds, 63. 



Water proofing, 317, 318. 



Weber's law, 448. 



Weismannism, 290. 



Welwitschia, 228. 



Wheat, aleurone grains, 392. 



Wheat rust, 82, 83, S4, 85. 



White rust, 6;. 



Witch brooms, 71. 



Wood, heart and sap, 347. 



Xanthophyll, 367. 

 Xenia, 271, 

 Xylaria, 77. 

 Xylem, 124, 241, 342, 

 path, 347. 



343, 344, 345; water 



Yeast, 70 ; fermentation, 410. 



Zamia, embryo, 200^ 201 ; habit, 103; sta- 

 men, 105; stem section, 1Q4; strobilus, 

 ig6. 



Zonal development, 254. 



Zoospore, 16, 22, 23, 25, 26, 28, 2g, 30, 32, 34, 



35, 45- 

 Zygnema, 38, 40. 

 Zygnemaceae, 38. 

 Zygomorphic flowers, 256. 

 Zygomycetes, 67. 



Zygospore, 16, 17, 22, 23, 25, 38, 3g, 40. 

 Zygote, 16. 

 Zymase, 410. 



