INDEX. 



445 



Optic nerve, its reflex action in pupil 



constriction, 1075 

 ,, an extension from the brain, 



iv. 4 



structure, iv. 55 

 cup, iv. 3 

 disk, iv. 56 



fibres, layer of in retina, iv. 56 

 ,, their insensibility to light, 



iv. Ill, 288 

 Optical systems, simple and complex, 



iv. 7 



Optogram, how obtainable, iv. 117 

 Ora serrata, iv. 5 



Ordeal by rice, its mode of action, 398 

 Organs, definition of, 8 



,, terminal, for sensations of touch 

 and temperature, iv.287 

 ,, ,, for sensations of pres- 



sure, iv. 290 



,, for sensations of heat 



different from those for 



sensations of cold,iv.291 



,, ,, nature of, iv. 293 



,, of reproduction, female, iv.351 



363 



,, male, iv. 364-373 



Os uteri, expansion of during ' labour,' 



iv. 396 

 Ossicles, auditory, iv. 181 



,, attachments of, iv. 187 



, , conduction of vibrations through, 



iv. 192 



Otoconia, iv. 210 

 Otoliths, iv. 210 



,, their possible functions, iv. 234 

 Ova, primordial, iv. 354 

 ,, early establishment of number of, 



iv. 357 



Ovary, early history of, iv. 354 

 ,, general structure, iv. 354 

 ,, changes in, after escape of ovum, 



iv. 358 

 Ovum, ripe, features of, iv. 356 



its nourishment by the Graaffian 



follicle, iv. 357 

 ,, escape of the, iv. 358 

 ,, transference to the uterus, iv. 360 

 ,, impregnation of the, iv. 374 

 ,, nutrition of, in the uterus, iv. 382 

 Oxidation in the tissues, seat of, 580 

 Oxygen, its absorption by the living 



body, 2 

 ,, borne by the blood to the tissues, 



13 



,, in proteids, 17 

 borne by haemoglobin, 33 35, 



572 



,, its presence necessary to mus- 

 cular irritability, 148150 

 ,, consumed during muscular con- 

 traction, 152 



,, its entrance to the blood by 

 diffusion, 526 



Oxygen, in air expired and inspired, 550 



,, relative proportions of in arterial 

 and venous blood, 553 



,, varying amounts of in venous 

 blood, 557 



,, relations of in the blood, 557 



,, absorption bf, by blood not ac- 

 cording to ' law of pressures,' 

 558 



its access in the lung to the 

 corpuscle, 573 



,, its relations in laboured breath- 

 ing and asphyxia, 575 



mode of storage in muscle tissue, 

 579 



,, " intramolecular," 579 



,, ,, sleep possibly due 



to exhaustion of 

 store of, iv. 415 



,, effect on respiration of deficiency 

 of, 600 



,, effect of breathing, 609 



,, results of high pressure of, 611 



,, mode of measuring amount con- 

 sumed, 793 



,, consumption of, as affected by 

 temperature, 815 



,, absorption of, during hiberna- 

 tion, 820 



,, supply of, to the embryo, iv. 

 382, 388, 392 



,, absorption of, in infancy, iv. 406 

 Oxyhsemoglobin defined, 564, note 



,, colour of, 566 



Oxyntic gland of frog, 419 



Pacchionian glands, 1126, 1130 

 Paciuian corpuscles, structure, iv. 268 



,, distribution, iv. 269 



Pain, sense of, iv. 281285 



,, localisation of, iv. 282 



,, ,, special nerve endings not 



needed for, iv. 284 

 "Pains" of labour, iv. 396 



,, their rhythmic character, iv.400 

 Pallor caused by emotion, 332 

 Palmitin, a constituent of animal fat, 772 



present in blood, 50 

 Palpitation of heart, its causes, 299, 345 

 Pancreas, structure of, 390 



,, histological changes during 



secretion, 404 

 of dog, 406 

 ,, its nerve supply, 433 

 Pancreatic juice, trypsin a constituent of, 



414 



its composition, 425 

 its action on food-stuffs, 



226230 

 ,, on fats, 474 

 ,, on proteids, 476 

 secretion of, 432 



,, circumstances af- 

 fecting, 433 



