738 



INDEX. 



Myographs, 460 

 Myopia, 573 

 Myosin, 69, 445 



NASAL ganglion, 528 

 Nausea, 548 

 Negative after image, 586 



variation of muscle current, 457 

 Nerve, active state of, 501 



ascending and descending cur- 

 rents, 511 



electric change in, 506 



electric properties of, 500 



electrotonus, 506 



force, velocity of, 504 



natural currents in, 500 



optic, 556 



roots, 519 



stimulation, negative variation, 

 506 



stimuli, 501 



terminals, 513 



tissue, 47 

 Nerves, afferent, 48, 498 



cranial, 522 



efferent, 48, 498 



excito-motor, 498 



gray, 498 



inhibitory, 498 



intercentral, 499 



mixed, 519 



motor, 498 



reflex, 498 



secretory, 498 



sensory, 498 



special physiology of, 519 



spinal, 519 



vasomotor, 499 



white, 498 



third pair of, 522 



fourth pair of, 523 



fifth pair of, 525 



sixth pair of, 524 



seventh pair of, 524 



eighth pair of, 529 



ninth pair of, 532 

 Nerve cells, 48 



bipolar, 515 



corpuscles, 496, 513 



functions of, 515 



in retina, 521 



multipolar, 515 



unipolar, 520 



Nerve endings, 538 



chemistry of, 500 



fatigue of, 508 



fibres, 48, 496 



irritability of, 508 



Nerve muscle preparation, 457, 501 

 Nervous system, 496 



medulla oblongata, 628 



reflex action, 617 



spinal cord, 496 

 Neurin, 74 

 Neuroglia, 496 

 Neuro-muscular cells, 47 

 Nitrogen, 82 



in expired air, 352 



in the atmosphere, 351 

 Nose, 553 . 



development of the, 716 

 Notochord, 657 

 Nucleolus, 33 

 Nucleus, 33, 35 

 Nutrition, 416 



and food stuffs, 97 



tissue changes, 417 



A DONTOBLASTS, 115 

 U (Esophagus, 120 



development of, 685 

 Olfactory bulb, 553 



mucous membrane, 553 

 Omphalo-mesenteric vessels, 699 

 Ophthalmoscope, 578 

 Optic axis of the eye, 566 



disk, 578 



lobes, 638 



nerve, 581 



nerve, terminals of the, 583 



thalami, 640, 642 



vesicle, 707 

 Ora serrata, 584 

 Organ of Corti, 607 

 Organisms, characters of, 28 



vital characters of, 83 

 Ossicles of the middle ear, 602 

 Ossifying cartilage, 60 

 Osteoblasts, 59 

 Otic ganglion, 529 



vesicle, 605 

 Otoliths, 605 

 Ovary, 650 

 Ovoid cells, 154 

 Ovum, 648 



changes in the, 654 



