6i6 



INDEX 



Vestigial organs, 522. 



Vexillum (or vane) of feather, 



400. 

 Vibrissse, 419. 

 Viscera, 26. 

 Vision, in crayfish, 261. 



in frog, 81. 

 Vitalism, 547. 



Vitality, suspended, 117, 548. 

 Vitreous humour, 80. 

 Vocal chords, 62. 

 Vocal sacs, 47. 

 von Baer's law, 510, 523. 

 Vorticetta, 138, 139, 140. 



imitation of sex in, 199. 

 Vulva, 419, 448. 



Warm-blooded animals, 60, 453, 



459- 

 Whales, 461. 

 White matter, 68. 

 Whiting, 381, 574. 

 Wings, 18. 



as homologous and analogous 

 organs, 521, 522. 



of cockroach, 272, 275. 



of insects, 282. 



of pigeon, 400. 



Wolffian duct, 65, 355-357, 387, 

 391, 414, 445= 446, 5°3- 



Xiphisternum, 37, 427. 

 Xiphoid cartilage, 37, 427. 

 Xiphoid processes, 427. 

 Xylol, use of, 554. 



Yeast, 535. 



Yellow cells, 221, 225. 



Yolk, 92, 478. 488, 504, 510. 



Yolk cells, 204. 



Yolk glands, 204. 



Yolk plug, 490. 



Yolk sac, 506, 507, 508. 



Zoochlorella, 167, 534. 



Zooids, v, 143, 173, 181. 



Zoology, I, 20. 



Zygantra, 392. 



Zygapophyses, 29. 



Zygoma, 431. 



Zygomatic arch, 428. 



Zygomatic process, of maxilla, 



431- 

 of squamosal, 428. 

 Zygosphenes, 392. 

 Zygote, 10, 107, 109, 182, 191, 



193. 199, 528. 



