INDEX. 



1043 



Nervous system, nerve-impulses of the, diffusion 



of, 648, 652, 653 



nerve-impulses of the, evidence of con- 

 tinuous outgoing of, 655 

 nerve-impulses of the, theories of the 



passage of the, 644 

 nerve-tracts in the, 668 

 nerves of the, specific afferent, 673 

 auditory, 679 

 olfacfory, 682 

 optic, 679 



special nerves of pain, 674 

 old age of the, 742, 743 

 organization of, 642, 734 

 organization and nutrition of the, 732-739 

 pathways of the, 648, 670, 675 

 phenomena of the, involving conscious- 

 ness, 606 



physiology of the, comparative, 703-705 

 processes in the, time taken in, 738 

 reaction of the efferent impulses, 660 

 reactions of, from fractures of the spinal 



cord, 660 



reactions of, during sleep, 740, 741 

 reactions of the spinal cord, segmental,658 

 reflex action of, 657-667 

 relations between body-weight and, 719 

 stimulation of the, conditions of, 647 

 strength of stimulus and strength of re- 

 sponses of, 648 

 subdivisions of, 605 

 symmetry of, bilateral, 645, 723 

 unity of the, 605, 639 

 sweat-centres in, 200 

 volume of the, 731 



changes in the, dependent upon age, 715 

 control of the mammary secretion by the, 



203 



disturbances of the, influence of, on body- 

 temperature, 580 

 influence of the, on functional activity, 81 



on heat-dissipation, 596 

 physiology of the, as a whole, 715 

 sympathetic, nerve-impulses in the, diffu- 

 sion of, 654 



weight of the, interpretations of, 717 

 Neuridin, 986 

 Neurilemma, 36, 150 

 Neurin, 986 



Neuroblast, the, 610, 611 

 Neuroblasts, polarization of, 611 

 Neuro-keratin, 151, 1020 



Neuron, axis-cylinder of the, constitution of, 614 

 defined, 607 



form of the, as a means of classification, 611 

 structure of the, 607 

 volume of the, 609 

 Neurons, medullation of, 614-616 



size of, in different animals, 609 

 Neutrophiles, 345 



New-born, body-temperature of, 577 

 expansion of the lungs in, 504, 573 

 respiratory movements of, 573 

 Nicotin, action of, upon the salivary glands and 



their secretions, 170 

 Nipple, origin of the, 201 

 Nitril defined, 985 

 Nitrogen, 954 

 compounds of the alcohol radicals with, 984 



with oxygen, 956 

 effect of respiration of, 548 

 equilibrium, defined, 284 

 in the body, 956 

 tension of, 525 

 Nitrogenous material, determination of amount 



destroyed in the body, 282 

 " Noeud vital," 564 



Noises, 832 



Non-nitrogenous material, determination of 



amount destroyed in the body, 283 

 Nose, tracts of the, 849 

 Notes, musical, quality of, 827, 828 

 Nuclein, 1019 

 Nucleo-albumins, 1019 

 Nucleo-histon, 347, 356, 1019, 1020 

 Nucleo-proteids, 1019 

 Nucleus, cell-, protoplasm of the, differentiation 



from cytoplasm of, 22 



Nutriment, effect of, on muscular fatigue, 78 

 Nutrition, body-, bile not essential for, 261 

 defined, 18, 19, 213 



of the embryo, 913 



of the placental process of, 914, 915 



of the heart, 461-482 



ODORS, detection of, by sensations of smell, 850, 



851 



skin, racial and individual, 851 

 (Esophagus, deglutition in the, 312 

 Oil, emulsions of, artificial, 245 

 Old age. See Age. 

 Olefines, amines of the, 986 

 Oncometer, Roy's, 196 

 Ophthalmometer, the, 750, 765 

 Ophthalmoscope, the, 772 

 " Optogram," 776 

 Organ of Corti. See Corti. 

 Organization. See Central Nervous System. 

 Organs, reproductive, female, 887-901 

 male, 882-887 

 mechanical and pathological changes in the 



female, due to pregnancy, 915, 916 

 respiratory, 503 

 secretory, internal, 205-211 

 sexual, classification of, 882 

 vocal, 107, 870-877 

 Ornithin, 994 

 Osazones, 1004 

 Osmometer, 251 

 Osmosis, 250-252 

 Ossicles, auditory, 810 

 function of, 813 

 ligaments of the, 811 

 Otolitbs or otoconia, 819, 849 

 Ova, irritability and contractility of, 37, 38 

 movements of, amoeboid, 37, 38 

 primitive, number of, in the ovaries, 892 

 Ovaries, primitive ova in, number of, 892 



structure of the, 892 

 Ovary, the, 892 

 Overtones, musical, 827 



inharmonic, 830 

 Ovulation, 892-894 

 Ovum, the, 888 



action of the spermatozoa in entering the, 904 

 chemistry of the, 889 



chromosomes of, power of hereditary transmis- 

 sion due to the, 22, 28 

 fertilization of, 904-906 

 growth of the, uterine, 911 

 human and fowl's, compared, 888, 913 

 discovery of, 888 

 form and size of, 888 

 structure of, 888, 889 



impregnation of, movements during the, 37, 38 

 maturation of the, 889-891 

 nucleolus of the, 889 

 nucleus of the, 888 

 nutrition of the, mode of, 37 

 protoplasm of, 37 



reception of the, by the Fallopian tube, 894 

 segmentation of the, 907, 908 

 Oxidation, body-, Hoppe-Seyler's theory of, 949 

 Traube's theory of causation, 946 



