454 



INDEX 



wattles, life-history, 280. 

 weapons, use of, 424, 425. 

 weeds, dispersal, 325. 

 Weismann, views of, 146, 166174, 

 176, 177, 178, 179, 180, 185, 189, 

 206, 219. 

 weka, 397, 398. 

 Wells, W. C., 385. 

 Western, 387. 

 whales, ancestry, 314318. 



,, cervical vertebra?, 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. 

 Wolff, 0. F., 163. 

 wombats, 301. 

 wood, 65. 



Woodward, A. S., 253, 294, 296, 300, 



301, 302. 

 worms, dispersal, 325. 



XYLEM, 65. 



X. 



Y. 



YOLK, 140, 267. 



,, corpuscles, 117. 



,, influence on development, 208 



270. 

 ,, sac, 270, 271, Fig. 120. 



ZETTGLODONTHXE, 318. 



zosea larva, 276, Fig. 128. 



zona radiata, 140. 



zooids, 43, 119. 



zoophytes, 34, 119. 



zoospores, 29. 



Zoothamniuin, 40. 



Zostero/is lateralis, dispersal, 324. 



Zygogonium, conjugation, 97, 143. 



zygosis, 83, 131. 



zygospore, 97. 



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



105, 109, 118. 



,, conjugation of nuclei in, 

 131, Fig. 64. 



PRADflURY, AONEW, & CO. LD., PRINTERS, LONDON AND TONBHIDGE, 



