INDEX. 



1583 



Optic nerve, its reflex action in pupil 



constriction, 1075 

 ,, ,, an extension from the brain, 



1142 



,, structure, 1193 

 cup, 1141 

 disk, 1194 



fibres, layer of in retina, 1194 

 their insensibility to light, 



1249, 1426 

 Optical systems, simple and complex, 



1145 



Optogram, how obtainable, 1255 

 Ora serrata, 1143 



Ordeal by rice, its mode of action, 398 

 Organs, definition of, 8 



,, terminal, for sensations of touch 

 and temperature, 1425 

 ,, for sensations of pres- 



sure, 1428 



,, for sensations of heat 



different from those for 



sensations of cold, 1429 



,, ,, nature of, 1431 



,, of reproduction, female, 1489- 



1501 



,, ,, ,, male, 1502-1511 



Os uteri, expansion of during ' labour,' 



1534 



Ossicles, auditory, 1319 

 attachments of, 1325 

 ,, conduction of vibrations through, 



1330 



Otoconia, 1348 

 Otoliths, 1348 



,, their possible functions, 1372 

 Ova, primordial, 1492 

 early establishment of number of, 



1495 



Ovary, early history of, 1492 

 ,, general structure, 1492 

 ,, changes in, after escape of ovum, 



1496 

 Ovum, ripe, features of, 1494 



,, its nourishment by the Graaffian 



follicle, 1495 

 ,, escape of the, 1496 

 ,, transference to the uterus, 1498 

 ,, impregnation of the, 1512 

 ,, nutrition of, in the uterus, 1520 

 Oxidation in the tissues, seat of, 580 

 Oxygen, its absorption by the living 



body, 2 

 borne by the blood to the tissues, 



13 



,, iu proteids, 17 

 ,, borne by haemoglobin, 33-35, 



572 



,, its presence necessary to mus- 

 cular irritability, 148-150 

 ,, 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 of, 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, 1553 



,, effect on respiration of deficiency 

 of, 600 



,, effect of breathing, 609 



,, results of high pressure of, Oil 



,, mode of measuring amount con- 

 sumed, 793 



,, consumption of, as affected by 

 temperature, 815 



,, absorption of, during hiber- 

 nation, 820 



,, supply of, to the embryo, 1520, 

 1526, 1530 



,, absorption of, in infancy, 1544 

 Oxyhsemoglobin defined, 564, note 



colour of, 566 



Oxyntic gland of frog, 419 



Pacchionian glands, 1126, 1130 

 Pacinian corpuscles, structure, 1406 



,, ,, distribution, 1407 



Pain, sense of, 1419-1423 



,, ,, localisation of, 1420 



,, ,, special nerve endings not 



needed for, 1422 

 "Pains" of labour, 1534 



,, their rhythmic character, 1538 

 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, 



226-230 



,, ,, ,, on fats, 474 



,, ,, ,, on proteids, 476 



,, secretion of, 432 

 ,, ,, ,, circumstances af- 



fecting, 433 



