488 



INDEX 



Toes, variation in number of (illus.), 



147. 



Torpedo (illus.), 334. 

 Tower, W. L., 404. 

 Toxopneustes libidus, egg cell of 



(illus.), 248. 

 Toyama, 192. 

 Trembley, Abbe, 286. 

 Tremex columba (illus.), 362. 

 Trial and theory of behavior, 430. 

 Trichia favaginea (illus.), 32. 

 Trichina spiralis (illus.), 356. 

 Trimen, 408. 

 Triton, regeneration of eye of 



(illus.), 287. 

 Trochilus rufus, nest of eggs of 



(illus.), 441. 

 Tropism, 282; theory of behavior 



by, 428. 

 Trout, ontogenetic variations in, 



208; rainbow (illus.), 343. 

 Tschermak, 192. 

 Tunicate (illus.), 364. 

 Turner, L. J., 39. 

 Turtle, hawk bill (illus.), 43; with 



two heads (illus.), 146. 

 Twig, insect (illus.), 412. 

 Two Ocean Pass (illus.), 317. 

 Types of animals (illus.), 31. 



Uexkull, 428. 



Uncinaria, parasite of seals (illus.), 



357. 



Unity, in life, 12, 22. 

 Urolophus goodi (illus.), 333. 

 Use and disuse, effects of, 206. 



Variation, 131; curves of (illus.), 

 140; Darwin's laws of, 137; 

 determinate, 150; determinate, 

 apparent example of, 152; onto- 

 genetic, in sticklebacks, 207; in 

 parthenogenetic animals, 155; 

 Quetelet's law of, 141; in wings 

 of honeybee (illus.), 155; (illus.), 

 156. 



Variations, acquired, 142; congeni- 



tal, 142; continuous, 146; dis- 

 continuous, 146; in function, 

 19; meristic, 148; substantive, 

 147. 



Variety, in life, 12. 



Vedalia cardinalis (illus.), 62, 64. 



Vegetables originated by Burbank, 

 98. 



Vertebrates, earliest remains of, 305 ; 

 gill slits of, 179. 



Vespa (illus.), 385; germanica, vari- 

 ation in pattern of (illus.), 134. 



Vespa, nest of (illus.), 328, 386. 



Vestigial organs, 174; explanation 

 of, 181; vestigial structures in 

 man, 461. 



Vitalism, 276; versus mechanism, 

 246. 



Volvocince, reproduction in, 217. 



Von Kolliker, 111, 114, 156. 



Vorticella nebulifera, conjugation of 

 (illus.), 221. 



Vulpes pennsylvanicus argentatus 

 (illus.), 21. 



Wagner, M., 108, 117. 



Wallace, A. R., 76, 108, 197, 311, 



319, 402. 

 Walnuts, Burbank's work (illus.), 



96; (illus.), 97. 

 Warblers, yellow, distribution and 



classification of, 120. 

 Wasmann, E., 394. 

 Wasp, social (illus.), 385; variation 



in pattern of (illus.), 134. 

 Wasps, communal life of, 385; social 



nest of (illus.), 328. 

 Water bug, giant (illus.), 340. 

 Weismann, A., 68, 154, 197, 198, 



423, 425; theory of protoplasmic 



structure, 251. 

 Wesley, J., 452. 

 Wheeler, W. M., 424. 

 Wheeler, W. W., 394. 

 Whitford, C. B., 168. 

 Whooping crane (illue.), 20, 

 Wiedersheim, 175, 461. 



