1039 



Electrical changes in muscle and 

 nerve, 97 

 with respiratory movements, 689 

 Electrocardiograms, 539 

 Electrodes, non-polarizable, 102 



stimulating, 87 

 Electrolytes, effect of, on osmotic 



pressure, 1028 

 Electrotonic currents, 109 

 Electrotonus, 89 



Eleventh cranial nerve, nucleus of, 246 

 Embryo, nutrition of, 988 

 Endocrin system, 863 

 Endogenous fibers of spinal cord, 168 

 Energy of muscular contraction, 36 

 Enterokinase, 787, 789, 795 

 Entoptic phenomena, 363 

 Enzymes, adenase, 745, 847 



amylase, 792 



arginase, 846 



chemistry of, 746 



classification of, 741 



deaminizing, 743 



definition, of, 741 



endoenzymes, 741 



enterokinase, 787, 795 



erepsin, 792, 79 3 



exoenzymes, 741 



general properties of, 743 



glycolytic, 745 



guanase, 745, 848 



historical account of, 737 



intracellular, 969 



inverting, 796 



lipase, 793 



nuclease, 745 



of muscle, 64 



oxidases, 743, 970 



pepsin, 774 



peroxidases, 970 



protective, 742 



ptyalin, 760 



rennin, 777 



reversible reactions of, 739 



specificity of, 740 



trypsin, 788 

 Epicritic sensations, 275 



sensibiUty, 274 

 Epigenesis, 999 

 Epinephrin, 871, 875, 876 



increased, effect on heart-beat, 591 



physiological action of, 872 

 Erection, physiology of, 1000 

 Erepsin, 796 

 Ergograph, 48 

 Erythroblasts, 437 



Erythrocytes. See Red blood-cor- 

 puscles. 

 Erythrodextrin, 761 

 Eserin, action of. on iris, 324 

 Ethereal sulphates, 852 

 Eupnea, 642 



Eustachian tube, 388 



Evolution, hjTDothesis of, in heredity, 



1003 

 Exercise, effects of, 73 

 Exogenous fibers in spinal cord, 168 

 Exophthalmic goiter, 868 

 Expiration. See also Respiration. 



definition of, 638 



expiratory center, 691 



muscles of, 641 

 Expired air, composition of, 660 



injurious effects of, 661 

 Extensibility of muscle, 20 

 Extensor thrust reflex, 156 

 Eye, abnormahties in refraction of, 315 



accommodation in, 309 



action of drugs upon, 324 



acuity of vision in, 339 



after-images in, 349 



as optical instrument, 302 



binocular field of vision, 369 

 perspective, 375 



chromatic aberration in, 315 



color bhndness of, 351 

 contrasts in, 350 

 vision in, 346 



complementary colors, 348 



corresponding points in, 369 



dark adapted, 334, 343 



diffusion circles in. 309 



diplopia in, 367, 370 



direct field of vision in, 338 



entoptic phenomena in, 363 



far point of distinct vision, 312 



function of cones, 356 

 of rods, 356 



fundamental color sensations, 347 



horopter, 372 



indirect field of vision in, 338 



inversion of image in, 307 



light adapted, 334, 343 

 reflex in, 322 



movements of, 365 



muscular insufficiency, 367 



nature of visual stimuli, 334 



near point of distinct vision, 311 



nodal point of, .306 



ophthalmoscopic examination of, 

 327 



optical defects of, 315 

 delusions, 379 



physics of formation of image in, 

 305 



qualities of visual sensations, 345 



reduced schematic (Listing), 306 



refractive power of, 313 



size of retinal images, 308 



spherical aberration in, 315 



stereoscopic vision, 375 



struggle of visual fields, 372 



.suppression of visual images, 372 



theories of color vision, 3o7 



