Vital activity, 201 Vital continuity, 134, 139, 155; genetic, first article of, 134; law of, 134, 155; law of, 139; its fourth article, 139 Vital force, no special, 201 Vitality, 150; eludes art of chemist, 150 Vital principle, 172, 200, 203; as defined by Neo-Vitalists, 172; entitive, not dynamic, 172; term alleged to be meaningless, 200; term in disfavor, 200 Vivisection, 360 Volcanic bombs, 346-348 Volition, 221, 231, 233; not function of the material organism, 233; presupposes conception, 221; rational, has spiritual soul for source and subject, 233; rational, superorganic, 231 Walrus, 296 Wasp, predatory, 247, 263 Weddas, cranial capacity of, 315 Weight, 315 Whale, 35, 46, 60, 279; flipper of, 35, 60, 279 White Leghorns, 19 Wild Kirchli, industry of, 331 Will, 221, 232, 235; insatiable, 232; of man, free, 232; self-determining or reflexive, 232; superior to sensual appetite, 235 Wing venation, 49 _note_, 49 Wisconsin, Cambrian sediments of, 105 Wolffian duct, 281, 282 Woods Hole, 23, 42, 47 World War, 359 Worm, 249 Wormwood, 248, 255; common, 255 Würtzburg, School of, 219 X-rays, 144, 317 Yoldia Sea, 289 Yolk-sac, 276 Zamia, 118 Zebra, 81 Zones, stratigraphic, 96, 103, 106; zoögeographical, 99 Zoölogists, 66, 77 Zoölogy, 35, 37, 55, 126, 304 Zoöpsychologists, 240 Zygote, 25, 136, 156-158