892 



INDEX. 



Ear, effect of stimulation of semi- 

 circular canals, 374 

 Eustachian tube of, 359 

 Flourens's experiments on semi- 

 circular canals, 372 

 functions in analyzing sound 

 waves, 365 

 of cochlea, 366 

 of ear-bones, 356 

 of sacculus, 379 

 of utriculus, 379 

 intrinsic muscles of, 358 

 limits of hearing, 370 

 position of bones in, 355 

 projection of auditory sensations, 



360 

 semicircular canals of, 372 

 sensations of discord, 369 



of harmony, 369 

 sensory epithelium in cochlea. 360 

 structure of, 353 



bones of, 355 

 theories of functions of semicircu- 

 lar canals of, 375 

 tympanic membrane of, 354 

 Eck fistula, 754 

 Efferent nerve fibers, 75 



occurrence in anterior roots, 77 

 in cranial nerves, 79 

 Ejaculation of spermatic liquid, 864 

 Elasticity and extensibility of muscle, 



19 

 Electrical currents during heart beat, 



480 

 Electrodes, non-polarizable, 95 



stimulating, 81 

 Electrolytes, effect of, on osmotic 



pressure, 882 

 Electrotonic currents, 101 

 Electrotonus, 83 

 Eleventh cranial nerve, nucleus of, 



230 

 Embryo, nutrition of, 852 

 Endogenous fibers of spinal cord, 



162 

 Energy of muscular contraction, 34 

 Enterokinase, 704, 711 

 Entoptic phenomena, 336 

 Enzymes, adenase, 664 

 amylopsin, 708 

 arginase, 756 

 chemistry of, 664 

 classification of, 661 

 definition of, 661 

 enterokinase, 704, 711 

 erepsin, 711 



general properties of, 663 

 glycolytic, 782 

 guanase, 664 



historical account of, 657 

 intracellular, 835 

 inverting, 711 



Enzymes, lipase, 709 



of muscle, 61 



oxidases, 836 



pepsin, 691 



peroxidases, 836 



ptyalin, 679 



rennin, 695 



reversible reactions of, 659 



specificity of, 661 



thrombin, 416 



trypsin, 705 

 Epigenesis, 866 

 Epinephrin, 776 

 Erection, physiology of, 863 

 Erepsin, 664, 711 

 Ergograph, 45 

 Erythroblasts, 402 

 Erythrocytes (see Red corpuscles) 

 Erythrodextrin, 680 

 Eserin, action of, on iris, 303 

 Esophoria, 340 

 Ethereal sulphates, 759 

 Eupnea, 575 

 Eustachian tube, 359 

 Evolution, hypothesis of, in heredity, 



866 

 Excretion, 721 



Exogenous fibers in spinal cord, 162 

 Exophoria, 340 

 Expiration (see also Respiration) 



definition of, 571 



expiratory center, 619 



muscles of, 574 

 Expired air, composition of, 592 



injurious effects of, 593 

 Extensibility of muscle, 19 

 External geniculates, 193, 197 

 Eye, abnormalities in refraction of, 

 295 



accommodation in, 301 

 mechanism of, 289 



action of drugs upon, 303 



acuity of vision in, 315 



after-images in, 323 



as optical instrument, 282 



binocular field of vision, 340 

 perspective, 346 



chromatic aberration in, 293 



color blindness of, 325 

 contrasts in, 324 

 vision in, 321 



complementary colors, 322 



corresponding points in, 340 



dark adapted, 310, 318 



diffusion circles in, 289 



diplopia in, 342 



direct field of vision^ in, 313 



entoptic phenomena in, 336 



far point of distinct vision, 292 



function of cones, 330 

 of rods, 330 



fundamental color sensations, 322 



