824 



INDEX. 



Valves, continued. 



of lymphatic vessels, 357. 



of veins, 178. 

 Valvulce conniventes, 305. 

 Vas deferens, 732. 

 Vasa efferentia, 447, 733. 



recta, 447, 733. 



vasorum, 144. 

 Vascular area, 751. 

 Vascular glands, 415. 



analogous to secreting glands, 416. 



in relation to blood, 417. 



several offices of, 418-21. 

 Vascular parts, nutrition of, 390. 



system, development of, 7^5- 

 Vaso-motor nerves, 153, 577. 

 Vascularity, degrees of, 171. 

 Vegetable life, its phenomena, I. 

 Vegetable matters, absorption of, 439. 

 Vegetable substances, digestion of, 



291. 

 Vegetables and animals, distinctions 



between, 6. 

 Veins, no, 178. 



absorption by, 370. 



anastomoses of, 182. 



circulation in, 180. 



coats of, 178. 



of cranium, 192. 



effects of muscular pressure on, 181. 

 of respiration on, 184. 



in erectile tissues, 194. 



force of heart's action remaining 

 in, 1 80. 



influence of gravitation in, ib. 



muscular tissue in large, 183. 



rhythmical action in, ib. 



structure of, 178. 



systemic, 113. 



valves of, 178. 



velocity of blood in, 186. 

 Velocity of blood in arteries, 167. 

 in capillaries, 174. 

 in veins, 186. 



of circulation, 187. 



of nervous force, 480. 

 Vena portse, its arrangement, in, 



322. 



Venous blood, characters of, 93-8. 

 Ventilation, necessity of, 224. 

 Ventricle, fourth, of brain, 512, 532. 

 Ventricles of heart, 112. 

 capacity of, 137. 

 contraction of, 120. 



Ventricles of heart, continued. 



contraction of, effect on arteries, 



155, 1 60. 



on circulation, 142. 

 on veins, 181. 

 force of, 136. 

 development of, 767. 

 dilatation of, 122. 

 of larynx, office of, 620. 

 Ventriloquism, 695. 

 mechanism of, ib. 

 Vermicular movement of intestines, 



350. 



Vermiform process, 525. 

 Vertebrae, development of, 745, 760. 

 Vesicle, germinal, 721. 

 Graafian, 716, 719. 



bursting of, 723-26. 

 umbilical, 746. 



Vesicles of vascular glands, 416. 

 Vesicula germinativa, 721. 

 Vesiculae seminales, 73^- 

 functions of, 737. 

 reflex movements of, 507. 

 Vesicular nervous substance, 475. 

 Vestibule of the ear, 677. 



of vagina, 718. 

 Vibrations, conveyance of to auditory 



nerve, 684. 

 perception of, 628. 

 of vocal cords, 618. 

 Vidian nerve, 551. 

 Villi of intestines, 312. 

 action in digestion, 343. 

 on intestinal glands, 308. 

 Villi of chorion, 752. 



in placenta, 757. 



Visceral arches, development of, 762. 

 cavities, serous membranes of, 401. 

 laminae, 746, 762. 

 layer of pleura, 199. 

 Vision, 637." 

 angle of, 656. 

 at different distances, adaptation 



of eye to, 650-52. 

 contrasted with touch, 657* 

 corpora quadrigemina the princi- 

 pal nerve-centres of, 522. 

 correction of aberration, 649, 650. 



of inversion, 654. 

 direction of, 657. 

 direction of rays in, how regulated, 



.653- 

 distinctness of, how secured, 648. 



