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 



in 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 



lue 



to exhaustion of 

 store of, 1553 

 , , 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 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 



