744 



INDEX 



Retina, action current in, 537. 



adaptation of, 540. 



centrifugal fibers to, 515, Fig. 211. 



excitation of, 536 seq. 



fatigue and recovery of, 539. 



histological structure of, 515, Fig. 211. 



images upon, 513. 



light-perceiving layer of, 514. 



morphological changes produced in, by light, 

 537, 538, Fig. 232. 



relation of properties of light to different 



constituents of, 541. 

 Retinae, correspondence of, 555. 



projection of, on cortex, 655. 



rivalry of, 555, Fig. 247; 556. 

 Retinal images, 511, 513. 



relation of, to tactile impressions, 556. 



size of, 554. 

 Retinal pigment, 541. 

 Retinal vessels, shadows of, 516. 

 Rheocord, 418, Fig. 156. 

 Rheotactic influence on spermatozoa, 697. 

 Rheotaxis, 56. 



Rheotome experiment, 431, Fig. 168. 

 Rheotome of Bernstein, 432, Fig. 169. 

 Rheotropism, 64. 

 Rhinencephalon, 600. 

 Rhizopoda, 37. 

 Rhombencephalon, 600. 

 Rhythmical contractions of cross-striated 



muscle, 53. 



Rhythmipal segmentation, 287, 288, Fig. 116. 

 Rib-lifting muscles, 315. 

 Ribs, movements of, 314. 

 Rigor mortis, 447. 

 Ringer's solution, 25 note; 182. 

 Rise of temperature, effect of, on lower organ- 

 isms, 29. 



in human body, 401. 

 Ritter's tetanus, 421. 

 Rivalry of retinse, 555, Fig. 247; 556. 

 Rods and cones, 515, Fig. 211. 



functions of, 541. 

 Rontgen rays, 58. 

 Root tubercles, 23, Fig. 18; 24. 

 Rotation, an effect of removing cerebellum, 

 608. 



in protoplasm, 42. 



Rotation axes of eye, 549, 550, Fig. 240. 

 Rotation center of the eye, 549. 

 Round window, 497. 

 Rubro-spinal tract in the cord, 593, 595. 



Saccharinic acid, 374. 



Saccharose, 81. 



Sacculus of internal ear, 473. 



Sacral nerves, 392, Fig. 145; 393. 



Salicylic acid, 378. 



Sahcyluric acid, 378. 



Saliva, 245, 246. 

 Salivary glands, 257. 



electrical phenomena of, 48, 257. 



morphological changes in, 261. 



nerves of, 257, 258. 

 centers for, 261. 



specific excitants of, 260. 

 Salt, common, physiological importance, 25. 



physiological solution of, 53. 

 Salt hunger, 131. 

 Salt plasma, 157. 

 Salt taste, 484. 

 Salting out, 69. 



Salts, required by animals, 25, 26; see also 

 Inorganic substances and Constituents, 

 inorganic. 



by heart, 25, 182. 



by plants, 24. 



Sap of plant cells, 21, Fig. 16; 33. 

 Saponification equivalent of fats, 79. 

 Sarcolactic acid, 376. 

 Sarcolemma, 16. 

 Saturation of color, 541. 

 Scaleni muscles, 315. 

 Scheiner's experiment, 553, Fig. 243. 

 Schematic eye, 511, 513, Fig. 210. 

 Schwann's experiment, 439. 

 Scyllium canicula, brain of, 619, Fig. 275. 

 Season, influence of, on growth, 710. 

 Sebaceous glands, 394. 

 Sebum, 394. 



Secondary contractions, 433. 

 Secondary sexual characters, 357. 

 Secondary tetanus, 433. 

 Secretin, 271. 

 Secretion, as a process, definition of, 41. 



conditions for, in stomach, 265. 



filtration theory of, 259. 



in intestinal glands, 276. 



in pancreas, 269. 



in salivary glands, 257. 



in sebaceous glands, 394. 



internal, 356; see also Internal secre- 

 tion. 



of bile, 272. 



of digestive fluids, 256. 



of sweat, 396. 



paralytic, 259. 



psychical, 263. 

 Secretion as a product, see under individual 



names. 



Secretion capillaries, 267, Fig. 105. 

 Secretion droplets, 244, Fig. 99. 

 Secretion vacuoles, 261, Fig. 101. 

 Secretory nerves, 564, 681 ; see also under differ- 

 ent glands. 



Segmental reflexes, 576. 



Segmentation of central nervous system, 575. 

 Selachians, extirpation of cerebrum in, 619. 



