558 



INDEX 



Tschermak, 49. 



Tsetse fly (Glossina), 161, 204, 279. 



Tuatera (Sphenodon), 365, 452. 



Tumor, 25. 



Tundra, 469. 



Tunicata (Ascidians), 321, 322, 323. 



Tupaia, 433. 



Turbellaria, 229-230, 233. 



Turtle ; see Chilonia. 



Twins, 38, 87; identical, 38; 



Siamese, 38. 

 Types, 171. 

 Typhlomolge, 361. 



Ulna, 332. 



Ungulates, 433. 



Universe, the physical, 1-4, 530, 



535_; _energy, 3-4; life, 2-4; 



limitations of mind, I ; matter, 



3; nature, laws of, i, 48, 535; 



phenomena, 4; reality, i; truth, 



2 ; see also Matter. 

 Urodela, 360-361. 

 Ursidae, 402. 



Vaccination: for anthrax, 486; for 

 hydrophobia, 487. 



Vallery-Radot, Rene, 488. 



Van Dyck (Vandyke), Anton, 52. 



Variation, 72, 80, 115-119, 134; 

 combinations, 117; environment, 

 118; forms of, 118; kinds of, 

 115; universality of, 115. 



Variety, botanical and zoological, 

 172. 



Venetz, 513. 



Ventricles, 338, 340. 



Vermes, 181, 430; see Annelida; 

 Nemathelminthes ; Nemertina ; 

 Platyhelminthes ; Rotatoria. 



Vermilion (coloring), 309. 



Verrill, 516. 



Vertebras, 329; amphiccelus v., 329. 



Vertebrata, 86, 178, 182, 320, 321, 

 328-341, 432; evolution of, 340; 

 structure of, 328-341; see Am- 

 phibia; Birds; Cyclostomes; 

 Fishes; Mammalia; Reptilia. 



Vestigial structures, 139. 



Vilmorin wheat, 196. 



Virus, 200. 



Viverridse, 401. 



Vries, Hugo de, 49, 64, 143. 



Walcott, Charles D., 149, 156. 



Walden, B. H., 319. 



Waldheimia, 227. 



Wallace, Alfred Russel, no, 136, 



290, 292, 447, 448, 449, 451, 453, 



466, 471, 530. 

 Wapiti, 411. 

 Ward, 235, 242. 

 Warren, 393. 



Wasps ; see Hymenoptera. 

 Water, 31. 



Water bear (Tardigrada), 254. 

 Waverlian Epoch, 148. 

 Wax, 309. 

 Weed, C. M., 395. 

 Weismann, 17, 132. 

 Whale, 369, 467. 

 Wheeler, W. M., 303, 307. 

 Whipple, 235, 242. 

 Whittier, 518. 

 Wilson, Edward A., 470. 

 Wilson, E. B., 64. 

 Woodruff, 1 6. 

 Woodward, A. Smith, 439. 

 Work, 32. 

 Worms ; see Vermes. 



Xantus, John, 525. 



Xenia, 68. 



Xenorhynchus asiaticus, 385. 



Xiphosura, 260; X. polyphemus, 260. 



Xylocopa, 296. 



Yeasts, 31, 483. 

 Yucca, 445. 



Zaglossus, 396-397. 

 Zoaria, 226. 

 Zones, Life, 454-478. 

 Zooecium, 226. 

 Zoophytes, 40, 95, 211. 

 Zostera, 473. 



Zygote, 38, 55, 58, 67, 69, 82, 83, 85, 

 1 1 6, 126. 



