8i6 



INDEX 



Skin, carbon dioxide exhaled by, 446 



excretion by, 444, 456 



excretory function of, 441, 444 



functions of, 441, 444 



glands of, 424 



loss of heat from, 504 



structure of, 441 



water excreted by, 445 

 Sleep, 673 

 Small intestine, absorption in, 414 



digestion in, 390 

 Smell, center for, 646 



sensation of, 757 



sense of, 694 



Sodium salts in the body, 103, 104 

 Solidity, judgment of, 754 

 Solutions, isotonic, 154 

 Somesthetic area of brain, 644 

 Somnambulism, 674 

 Sound, 707 

 Sounds, articulate, 555 



localization of, 711 



of the heart, 183 



pitch of, 707 

 Speech, 544, 554 



action of tongue in, 555 



of mouth in, 555 

 Spermatids, 782 

 Spermatocytes, 781 

 Spermatogonia, 781 

 Spermatozoa, 783, 785, 786 

 Spherical aberration, 734, 761 

 Sphygmogram, 239 

 Sphygmograph, 238 

 Sphygmomanometer, 226, 239 

 Sphygmometer, 238 

 Spinal accessory nerve, 662 



centers, 596, 597, 598 



cord, 580 



anterior pyramidal tract, 586 

 antero-lateral descending tract, 



587 



arrangement of nerve cells in, 582 

 ascending degeneration, tracts of, 



587 



comma tract of, 587 

 conduction in, 600 

 course of motor impulses in, 602 



of sensory impulses in, 601 

 descending degeneration, tracts 



of, 586 

 direct cerebellar tract, 587 



Spinal cord, fasciculi of, 584 

 functions of, 590 

 general features of, 580 

 Gowers' tract, 562 

 irradiation of impulses in, 593 

 lateral pyramidal tract, 586 

 peculiarities of different regions, 



590 



reflex action in, 590 

 tracts of, 584 

 weight of, 632 



nerve-roots, functions of, 588 

 nerves, 588 



anterior roots, 588 

 course of fibers, 588 

 posterior roots, 589 

 reflexes, 595 

 Spirem, 20 

 Spirometer, 295 



Spleen, vascular nerves for, 257 

 Spongioplasm, 9, 17 

 Staircase contractions, 520 

 Stammering, 556 

 Starch, 101 



action of amylopsin on, 382 



of ptyalin on, 356 

 animal, 102 



chemical reactions on, 113 

 hydrolysis of, 113 

 Starvation, 472 



death from, 474 



effect on body temperature, 473 

 influence of, on excretions, 474 

 symptoms of, 473 

 Steapsin, 347, 382 

 Stercobilin, 387 

 Stereoscope, 754 

 Stethograph, 292 

 Stimuli, forms of, 512 



maximal and minimal, 510, 560 

 Stokes' fluid, 141 

 Stomach, 360 



absorption from, 412 



action of pylorus, 374 



blood-vessels of, 364 



changes in glands during secretion, 



365 



digestion in, 358, 360, 372 

 gases in, 394 

 glands of, 363, 365 

 hunger contraction of, 375 

 lymphatics of, 364 



