902 



INDEX. 



Retina, qualities of visual sensations 

 from, 320 

 size of fovea in, 314, 315 

 theories of color vision in, 331 

 threshold stimulus of, 317 

 visual purple of, 310 



Reversible chemical reactions, 659 



Rheoscopic frog preparation, 99 



Rhodopsin, 310 



Ribs, action of, in inspiration, 573 



Rigor of muscle, 49, 51, 62, 66 



Ringer's solution, 387 



Ritter's tetanus, 86 



Rivinus, ducts of, 666 



Rods and cones of eye, functions of, 

 330 



Sacculus, functions of, 379 

 Saliva, chorda, 673 

 composition of, 669 

 digestive action of, 679 

 general functions of, 681 

 secretory nerves for, 670 

 sympathetic, 673 

 Sahvarv glands, action of drugs upon, 

 676 

 anatomical relations, 666 

 histological changes during ac- 

 tivity, 674 

 structure of, 668 

 normal stimulation of, 678 

 secretory center for, 679 



nerve fibers of, 672 

 theory of secretory nerves, 673 

 Salts, absorption of, in stomach, 698 

 excretion of, 760 



general nutritive importance of, 

 801 

 Sarco lactic acid, 60 

 Sebaceous glands, secretion of, 769 

 Secondary axes of a lens, 284 



degeneration, nerve fibers, 117, 157 

 proteoses, 693 

 Secretion, 703, 711 

 internal, 771 

 of bile, 727 



of sebaceous glands, 769 

 of sweat, 767 

 of urine, 742 

 Secretogogues of gastric glands, 690 

 Secretory nerves of salivary glands, 



671 

 Semicircular canals, direct stimula- 

 tion of, 374 

 Flourens's experiments upon, 372 

 structure of, 372 

 temporary and permanent effects 



of operations on, 374 

 theories of functions of, 375 

 Seminal vesicles, function of, 861 

 Senescence, 871 



Senses, classification of, 249 



cutaneous, 256 

 Sensory aphasia, 206 

 areas of cortex, 188 

 paths in spinal cord, 161 

 Sequence of heart beat, 507 

 Serin, 874 



Serum, action of foreign, 389 

 -albumin, 410 

 -globulin, 411 

 Seventh cranial nerve, nucleus of. 



229 

 Sex, determination of, 868 

 Side-pressure in blood-vessels, 460 

 Sixth cranial nerve, nucleus of, 229 

 Skatoxylsulphuric acid, 719, 760 

 Skeletal muscular tissue, physiology 



of, 18 

 Skin, excretory functions of, 766 



sweat glands of, 766 

 Sleep, changes in circulation during, 

 242 

 curves of intensity of, 239 

 effect of sensory stimulation dur- 

 ing, 243 

 hypnotic, 248 

 metabolism during, 811 

 physiological phenomena of, 238 

 theories of, 244 

 Small intestine, absorption in, 712 

 Smegma prseputii, 770 

 Smell, center for, in brain, 204 



end-organ of, 275 

 Smelling, mechanism of, 276 

 Sodium chlorid, nutritive value of, 

 802 

 salts, effect of, on heart-beat, 501 

 Somatoplasm, definition of, 872 

 Sound, sensations of (see Ear) 

 waves, nature and action of, 361 

 overtones of, 364 

 simple and compound, 363 

 Specific energy of taste sensations, 

 273 

 gravity of blood, 383 

 nerve energies, doctrine of, 115, 

 251 

 of cutaneous nerves, 258 

 Spectra, absorption, blood, 394 

 Spectroscope, 395 

 Spermatozoa, chemistry of, 862 

 maturation of, 861 

 properties of, 860 

 Spermin, 779 



Spherical aberration in eye, 294 

 Sphygmography, 472 

 Sphygmomanometers for determin- 

 ing blood-pressure in man, 456 

 Spinal cord, anterior marginal bundle 

 of, 170 

 as path of conduction, 154 

 classification of tracts in, 157 



