INDEX 



745 



Self-consciousness, origin of, 672. 

 Self-digestion of the stomach, 269. 

 Self-regulation of respiratory movements, 328. 

 Semicircular canals, 473. 



artificial stimulation of, 479. 



experimental suppression of, 476, Figs. 187, 



188; 477, Fig. 189. 

 Semilunar valves, 167. 



closure of, 171. 



muscular supports of, 167. 



opening of, 171. 

 Seminal fluid, 692, 693, 694. 

 Seminal vesicles, 692. 

 Semipermeable membrane, 33. 

 Semipermeable walls, 31. 

 Senescence, 66. 

 Sensations, auditory, 489. 



correspondence of, to reality, 452. 



definition of, 451. 



degrees of distinction of, 453. 



gustatory, 483. 



modalities of, 453. 



motor, 469. 



physiological significance of, 472. 



of color, 541. 



of pain, 458, 465. 



of position, 472, 473. 



of pressure and touch, 458, 461. 



of resistance, 461, 471. 



of temperature, 458. 



of weight, 456, 471. 



olfactory, 486. 



organic, 454, 469. 



place of origin of, 454, 659. 



qualitative relations of, to stimuli, 451. 



quantitative relations of, to stimuli, 455. 



specific, doctrine of, 455. 



tactile, 461, 466, 652. 



theoretical explanation of, 453. 



threshold stimuli of, 455. 



tickling, 462. 



transcendental, in essence, 455. 



visual, 536. 



Weber's law concerning, 456. 

 Sense of cold, 459. 



of force, 469. 



of hearing, 498. 



of heat, 459. 



of motion, 452. 



of pain, 465. 



of position, 469. 



of pressure, 461. 



of sight, 508. 



of smell, 54, 486. 



of taste, 483. 

 Senses, classification of, 451, 452; see also 



Sensations. 

 Sensory aphasia, 664. 

 Sensory areas of cortex, 650. 



Sensory areas of cortex, connected together, 

 659. 



general sensation and touch in, 654, Figs. 

 293 and 294. 



hearing in, 654, Fig. 293. 



psycho-physical significance of, 659. 



recapitulation concerning, 658. 



taste and smell in, 653, 654, Fig. 294. 



vision in, 654, Fig. 293. 

 Sensory impressions, conduction of, in cord, 



597. 

 Sensory spinal nerves, 682. 



distribution of, 683, Fig. 300. 

 Serin, 70, 72. 



Serous cavities, absorption from, 353. 

 Serrati muscles, 316. 

 Serum, 154. 



agglutinating action of, 156, 157. 



bacteriocidal action of, 155, 156. 



CO 2 in, 340. 



cytolytic action of, 156. 



mineral substances in, 154. 



organic substances in, 154, 155. 



oxygen in, 340. 

 Serum albumin, 154. 

 Serum globulin, 154. 

 Sex, influence of, on heart beat, 197. 



on metabolism, 144. 

 Sexual glands, accessory, 691, 692. 

 Sexual maturity, in man, 692. 



in woman, 696. 

 Sexual organs, female, 695. 



male, 691. 

 Shock, effect of, in experiments on respiration 



326. 



in lesions of motor areas, 646. 

 Shrimp, gaivanotaxis of, 60, Fig. 34. 

 Sighing, 321. 



Sight, sense of, 451; 508; see also Vision and 

 Eye. 



cortical area for, 655. 



reaction time to, 674. 

 Sigmoid flexure of colon, 299. 

 Sigmoid gyrus, 266, 632, Fig. 282. 

 Signal, electric, 10, Fig. 7. 

 Simultaneous contrast, 547. 

 Sinuses of Valsalva, 167. 

 Siren, Seebeck's, 490, Fig. 193. 

 Size, judgment of, by vision, 554, Figs. 244, 



245, 246. 



Skatol, 295, 378, 379. 

 Skatoxyl, 379. 



Skatoxyl-sulphuric acid, 379. 

 Skeletal muscles, see Muscles. 

 Skin, electrical phenomena of, 48. 



excretory functions of, 394. 



glands, stimulation of, by alkalies, 59. 



heat loss by, 395, 403. 



insensible perspiration of, 397. 



