738 



INDEX 



Nitrogen in urine, 89. 

 Nitrogen excretion, 89, 90. 



diurnal variations of, 102, Fig. 44. 



in starvation, 100, 101. 



proportional to N absorbed, 101. 

 Nitrogenous equilibrium, 91, 120, 121, 122. 



minimum proteid for, 103. 



on various quantities of proteid, 100. 

 Nitrogenous substances in the body, 68. 

 Nodal points of optical system, 511, Fig. 209. 



of schematic eye, 513, Fig. 210. 

 Nonnitrogenous foodstuffs, see Carbohydrates 

 and Fats. 



destruction of, in muscular work, 112. 

 Nonnitrogenous substances in the body, 79. 

 Nonnucleated cells, 17. 

 Nubecula in urine, 380. 

 Nuclei of cranial nerves, 603, Fig. 269. 

 Nucleic acid, digestion of, 255. 



percentage composition of, 82. 

 Nuclein bases, 76 ; see also Purin bases. 

 Nucleins, 76, 351, 372. 



digestion of, 252, 255. 



percentage composition of, 82. 

 Nucleo-albumins, 75. 



Nucleo-histon, percentage composition of, 82. 

 Nucleo-proteids, 77. 



Nucleus, agency of, in activation of oxygen, 19, 

 note. 



form and size of, 16. 



importance of, 17, 18. 



number in cells, 16. 



of cell, 16. 



of ovum, 695. 



reciprocal relations of, with protoplasm, 17. 



red, of tegmentum, 593. 

 Nucleus reticularis tegmenti, 603. 

 Nutrition, see Food and Nutritive requirements. 



definition of, 83, note; 137. 



of the brain, 676. 



of the heart, 180. 



of the young, 143. 



physiology of, 137. 

 Nutritive influence of cerebral cortex, 650. 



of nerve cells, 567, 568, 582, 584. 



of spinal ganglia, 584. 

 Nutritive requirements of adult males, 140. 



of persons of different ages, 144. 



Occipital convolutions, 639, Fig. 289; 657. 

 Octave, 490. 

 Oculo-motor nerve, 680. 



accommodation and, 534. 



nuclei of, 535, Fig. 230; 615, Fig. 272; 616, 

 Fig. 273. 



pupil and, 528. 

 Odors, classification of, 488. 



theories of transmission of, 486, 487. 

 CEsophageal fistula, 263. 



(Esophagus, innervation of, 281. 



movements of, in swallowing, 280. 

 Ohm's law for analysis of sound, 493. 

 Oil and coagulation of blood, 159. 

 Old age, metabolism in, 120. 



period of, 706. 

 Oleic acid, 296. 

 Olein, 79, 701. 

 Olfactometer, 487, Fig. 192. 

 Olfactory areas in the cortex, 653. 

 Olfactory cells, 487. 

 Olfactory epithelium, 486. 

 Olfactory lobe, 600, 619. 

 Olfactory nerves, action of, on respiration, 330. 



specific, of smell, 488. 

 Opalina ranarum, 61, Fig. 35. 

 Opening contraction, 420, 423. 

 Opening period of parturition, 698. 

 Operative interference, 5. 

 Optic cortex, activity of, 660. 



connections of, 660, 662, Fig. 296; 663. 



efferent fibers from, 657. 

 Optic lobes, Figs. 274, 275, 276, 277, 278. 



equivalent to corpora quadrigemina, 613; 



which also see. 



Optic nerve, 330; 535, Fig. 230; 656, Fig. 295; 

 657, 680. 



efferent fibers in, 515, Fig. 211. 



reflex effect of, on respiration, 330. 

 Optic thalamus, 600. 



effect of lesions in, 617. 



substitution of functions in, 617. 

 Optic tracts, schematic representation of, 535. 



Fig. 230; 656, Fig. 295. 

 Optical axis, 513, Fig. 210; 525. 

 Optical constants of the eye, 508. 

 Optical defects of the eye, 520. 

 Optical system, nodal points of, defined, 511, 

 Fig. 209. 



of the eye, 509, 510. 

 Optical zone of the cornea, 522. 

 Optogram, 537. 



Organ of Corti, 499, 500, Fig. 199. 

 Organ system, definition of, 30. 

 Organic foodstuffs, 83. 

 Organic sensations, 469. 

 Organs, cooperation of, 30. 



influence of, on one another, 1, 355. 



surviving, 6. 

 Orientation, importance of otolith sacs for r 



473, 481. 

 Oscillaria, 29. 

 Osmosis, 31. 



Osmotic phenomena, significance of, for ab- 

 sorption, 35, 301, 353. 

 for different organs and tissues, 34, 355. 

 for elementary organisms, 33, 34. 

 for excretion, 41. 

 for lymph formation, 349. 



