INDEX, 
Optic thalami, 518. 
Optic thalamus, functions of, 536. 
Optical imperfections of the eye, 572. 
Organic evolution, 41, 
Organs, electrical, 199. 
Origin, the, of the germs of life, 41. 
Ovary, origin of, 110. 
Ovulation, 115. 
Ovum, the, 54. 
origin and development of, 57. 
changes in, 59. 
fertilization of, 62. 
nutrition of, 115. 
Oxyhemoglobin, 386. 
Pacinian corpuscles, 552. 
Pancreatic juice, 315. 
Physiology of secretion, 323. 
Paraglobulin, 159, 674. 
Parthenogenesis, 53. 
Parturition, 120. 
Patellar reflex, 494. 
Path of impulses in spinal cord, 491. 
Peduncles of the brain, 537. 
Pepsin, 311. 
Peptone, 310, 315. 
Peptones, 675. 
Perspiration, excretion of, 416. 
Pettenkofer’s test, 684. 
Phenol, 690. 
Physiology of secretion, 319. 
sweating, 417. 
Pigments of urine, 685. 
Placenta, 80. 
the discoidal and meta-discoidal, 81. 
the zonary, diffuse, polycotyledonary, 
86. 
evolution of, 89. 
Poikilothermer, 465. 
Polar cells of globules, 59. 
Polyps, 22. 
Pons Varolii, 518. 
functions of, 541. 
Predicrotic, 249. 
Pressure sensations, 554. 
Pressures, endocardial, 238. 
Primitive streak, 71. 
groove, 71. 
Pro-amnion, 78. 
Production of heat, 465. 
Pronephros, 95. 
Pronucleus, female, 60. 
697 
Protagon, 683. 
Protective mechanism of the eye, 596. 
Proteid metabolism, 455. 
Proteids, 671. 
properties and classification of the, 672. 
general characteristics of, 138. 
classification and distinguishing char- 
acters of, 138. 
of milk, 291. 
metabolism, 455. 
tests for, 672. 
coagulated, 675. 
Protococcus, morphology and physiology 
of, 11, 12. 
Protoplasm, 2, 27. 
Protovertebre, 95. 
Psychological aspects of vision, 586. 
Pulse, the, 244. 
venous, 251. ; 
Pupil, alterations in the size of the, 569. 
Quantity of air respired, 378. 
Reaction time, 536. 
Reduced reaction time, 536. 
Reflex action, 211. 
functions of spinal cord, 484. 
time, 486. 
Reflexes, inhibition of, 485. 
Refraction, anomalies of, 574. 
Regulation of temperature, 464. 
Regurgitation, 340. 
Reproduction, 50. 
Research and reasoning, physiological, 
141. 
Respiratory system, 365. 
sounds, 379. 
Respiration, muscles of, 372. 
types of, 378. 
comparative, 375. 
pathological, 379. 
in the blood, 383. 
in the tissues, 392. 
relation of nervous system to, 393. 
influence of condition of blood in, 397. 
Cheyne-Stokes, 398. 
effects of variations in atmospheric 
pressure, 899. 
influence on circulation, 400. 
clinical and pathological, 408, 
evolution, 409.- 
Resting stage of ovum, 65. 
