INDEX. 



1037 



Irritability, effect on, from separation of nerves 



from the central nervous system, 75 

 efficacy of the blood to preserve, 74, 75 

 influence of the blood on, 73 

 kathodic, 68, 69, 70, 72 

 loss of, by separation of muscles, 76 



by separation of nerves, 75, 76 

 of muscle, defined, 35 

 curare experiment, 41 

 independent, 40 



of muscles and nerves, conditions which deter- 

 mine, 64 



effect of heat and cold on, 66 

 of nerves, 38-4 



chemical irritation, 40 

 electrical irritation, 40 

 mechanical irritation, 40 

 thermal irritation, 40 

 curare, experiment for determining, 40, 41 

 influence of constant electric currents on 



the, G9 

 result of change in the chemical constitution 



of muscles and nerves, 67, 68 

 vital, definition of, 18 

 Irritability and conductivity of nerve-fibres, 624 



and contractility of ova, 37, 38 

 Irritant, electric current as a muscle and nerve, 



43-60. See Electric current. 

 Irritants, classes of, 38 

 effect of, study of the, 39 

 efficiency of, on muscles and nerves, 43 

 influence of, upon the irritability of muscle 



and nerve, 65 



effect of chemicals and drugs, 67 

 effect of electric current upon the mus- 

 cles, 68 



effect of electric current upon nerves, 69 

 effect of temperature, 66 , 

 effect of the frequent application of the 



stimulus on irritability, 72 

 mechanical agencies, 65 

 relative value of different, 38 

 Irritation, direct, of muscle-protoplasm, proofs 



of, 42 

 nerve, by electric current, Du Bois-Reymond's 



law, 47 



frequency of stimuli and effect of, 65 

 of nerve and muscle, result of, conditions 



determining, 42 

 " Isodynamic equivalent," 304 

 Isornaltose, 1007 

 Iso-nitril, an, defined, 985 



JAUNDICE, causation of, 189 



Jaw movements, muscles concerned in the, 310 



Joint-movements, classes of, 856 



ball-and-socket joint, 857 



hinge joints, 856 



saddle joint, 857 



sliding joints, 856 

 Joints, union of bones by, 855 



KAEYOKINESIS defined, 19, 20 

 Katabolism defined, 20 



of animal protoplasm, 20 

 Ka-telectrotonus, 69 

 Kathode defined, 44 



physical and physiological defined, 62 

 Keratin, 1020 

 Ketone, dimethyl, 982 

 Kidney, 189, 273 



Kidneys, blood-flow through the, 195 

 action of diuretics 011 the, 195 

 regulation of, by the vaso-motor nerves, 

 196, 197 



glands of the, secretory, 189-195 



nerves of the, vaso-motor, 498 



Knee-kick, muscular reaction involved, 649- 



652 



reinforced nerve-impulses of, 665-666 

 Kymograph, the, 381 



LABOR, nature of, 919, 920 



stages of, 917-919. See also Parturition. 

 Labor-pains. 918 

 Labyrinth, the, 815 

 membranous, 815 

 fluids of, 817 



transmission of vibrations through the, 820 

 osseous, structure of, 815, 816 

 Lactates in human urine. 278 

 Lacteals, absorption of fat by the, 258 

 Lactose, 202, 1006 



relations of, to glycogen-formation, 268 

 Language defined, 874 

 Lanolin, 198 



Larynx, appearance of the, laryngoscopic, 869 

 cartilages of the, 865 

 movements of the, 516 

 muscles of the, 865-868 

 nerve-supply of the, 868 

 self-examination of, method of, 869 

 stricture of, 861-869 

 ventricular bands of, 862, 863 

 Latent characters, inherited human, 932 

 heat, 948 



period defined, 101 

 differentiation of electrical and mechanical, 



102 



in retinal sensation, 789 

 of muscular contraction, 113, 114 

 Laughing, 562 

 Lecithin, 265, 1001 

 Lens, achromatic, discovery of the principle of 



the, 762 



Leucin, 242, 983 



Leucocytes, blood-, action of, 346, 374 

 classification of, 345, 346 

 lymphocytes, 345 

 mononuclear, 346 

 polymorphous or poly nucleated, 346 

 emigration of, 346, 376 

 functions of, Ci5, 346 

 movements of, 35 



amo3boid, 346 

 origin of, 347 

 physiology of, 345 

 " Leuconuclein," 356 

 Levulose, 218, 1005 



Life, phenomena of, hypotheses of, 25, 26 

 Light, "dispersion" of, 778 

 intensity of, 778, 785 

 modifications of, 779 

 color, 779 

 color-blindness, 784 

 color-mixture, 779 

 color-theories, 781 

 intensity, 785 

 luminosity of colors, 786 

 saturation, 788 

 retinal, changes produced by, 776 

 saturation of, 7^9, 788 

 sensation of, retinal, 777, 778 

 Limbs, nerves of the, vaso-motor, 501 

 Lipochromes, 1015 

 Liquor amnii, function of, 911 



quantity and composition of, 911 

 Liver, blood-flow in the, relation of the secretion 



of bile to the, 187 



existence of secretory nerves to the, 188 

 extirpation of, effect of, on urea formation, 276, 



277 



functions of the, 260 

 glands of the, secretory, 184-189 



