INDEX 



475 



Turnip, 66 



Tympanic membrane, 197, 193 



Typhlosole, 124 



U 



Ulna, 144, 145, 352, 354 



Ulothrix, 61, 94, 95, 96, 413 



Ulva, 63, 413 



Umbilical cord, 205 



Underwing Moth, 320 



Ungulata, 349 



Unguligrade, 316 



Uniformitarian doctrine, 376, 406 



Unit character, 262, 280, 282, 286, 

 306 



Urea, 43, 176 



Ureter, 148-153, 179, 180 



Urinary bladder, 137, 148-153, 

 179 



Urinary and reproductive systems, 

 interrelationship, 179, 207 



Urogenital canal, 207; pore, 148; 

 system, 207; system of Verte- 

 brates, 179 



Uropod, 132 



Urostyle, 149 



Uterus, human, 205 



Utriculus, 196 



Vaccination, 339 



Vacuole, 26, 77; contractile, 9, 



40; food, 9; gastric, 40 

 Valves, 163, 165, 172 

 Variation, 237, 261; adaptive, 



378; fluctuating, 301; herita- 



bility of, 264-269; universality 



of, 410 



Varieties, 351 



Vascular bundle, 77, 78, 83 

 Vascular plants, 64, 103 

 Vascular system (see Circulation) 



Vaso-motor nerves, 174 



Vein, 163; of leaf, 77 (see Circula- 

 tion) 



Veinlets, 163 



Vena cava, 152 



Venous system, 166 (see Circula- 

 tion) 



Ventral aorta, 164, 171 



Ventral root, 192 



Ventricle, 163 



Vermiform appendix, 153, 155, 355 



Vertebra, 137, 141, 145, 153; 

 human, 143 



Vertebral column, 141 



Vertebrates, 117, 135-153; body 

 plan, 136-138; brains of, 189; 

 characters, 146, 147; circula- 

 tion and respiration, 161-174; 

 classification, 350, 416; coelom, 

 140; labyrinth, diagram of, 

 197; limb, plan of, 144> longi- 

 tudinal section, 137; skeleton, 

 140-146; skin, 138; transverse 

 section, 137; urogenital system, 

 179 



Vesalius, 384, 385, 394 



Vespertilio, 318 



Vestigial organs, 317, 355, 361, 362 



Violet seed, 111 



Vitamines, 14 



Vitreous humor, 201 



Vocal organ of Bird, 151 



Volant, 316 



Volvox, 55, 56, 217 



de Vries, 269 



W 



Walking-stick, 322 



Wallace, 410 



Warm-blooded animals, 176 (see 

 Homothermal) 



Waste, nitrogenous, 43; and re- 

 pair, 10 



