454 



INDEX 



wattles, life-history, 280. 



weapons, use of, 424, 425. 



weeds, dispersal, 325. 



Weismann, views of, 146, 166174, 



176, 177, 178, 179, 180, 1537189, 



206, 219. 

 weka, 397, 398. 

 Wells, W. 0., 385. 

 Western, 387. 

 w hales, ancestry, 314 318. 



,, cervical vertebrae, 248, Fig. 

 103. 



convergence in, 248. 

 paddles, 244, Fig. 101. 



size, 303. 



systematic position, 301. 



vestigial organs in, 257, 260, 



Fig. 101. 

 wheat, improvement of, 411 413. 



,, Lamarck on, 378. 

 wind, dispersal by, 323. 

 winged animals, dispersal of, 323. 

 wings, 236. 



convergence in, 248 250. 



of bat, 243, Fig. 99. 



bird, 243, 244, Fig. 99. 



,, ,, insects, 247. 



,, pterodactyls, 242, Fig. 99. 

 wireless telegraphy, analogy of, 187. 

 Wolfe, C.F., 163. 

 wombats, 301. 

 wood, 65. 



Woodward, A. S., 253, 



301, 302. 

 worms, dispersal, 325. 



296, 300, 



X. 



XYLEM, 65. 



Y. 



YOLK, 140, 267. 



corpuscles, 117. 



influence on development, 268 



270. 

 sac, 270, 271, Fig. 120. 



Z. 



ZEUGLODONTID^E, 318. 



zoaea larva, 276, Fig. 128. 



zona radiata, 140. 



zooids, 43, 119. 



zoophytes, 34, 119. 



zoospores, 29. 



Zoothamnium, 40. 



Zoster ops later alis, dispersal, 324. 



Zygogonium, conjugation, 97, 143. 



zygosis, 83, 131. 



zy go spore, 97. 



zygote, 33. 83, 87, 88, 91, 97, 101, 



105, 109, 118. 



conjugation of nuclei in, 

 131, Fk'. 64. 



BBADBUBY, AGNEW, & CO. LD., PBINTEBS, LONDON AND TONBBIDGE. 



