8i 4 



INDEX. 



Penis, continued. 



development of, 784. 

 erection of, explained, 195. 

 reflex action in, 196, 507. 

 Pepsin, 282. 

 Peptone, 292. 

 Perception of sensations by cerebral 



hemispheres, 486, 534.' 

 Perichondrium, 51. 

 Perilymph, or fluid of labyrinth of 



ear, 679. 

 use of, 690. 

 Periosteum, 55. 

 Peristaltic movements of intestines, 



350. 



of stomach, 295. 

 Permanent cartilage, 50. 

 glands, 408. 

 teeth, 64. 



Perspiration, cutaneous, 435. 

 insensible and sensible, 436. 

 ordinary constituents of, ib. 

 Peyer's glands, 307. 

 functions of, 310. 

 patches, 308. 

 resemblance to vascular glands, 



311, 416. 

 structure of, 309. 

 Pharynx, 



action of in swallowing, 272, 502, 



560. 

 influence of glosso-pharyngeal 



nerve on, 554. 



of pneumogastric nerve on, 

 t 559, 56o. 



Phosphates in tissues, 26, 27. 

 present in albumen, 22. 

 in blood, 90, 91. 

 in urine, 463. 



Phosphorus in human body, 26. 

 union of with oxygen producing 



heat, 246, note. 

 in urine, source of, 463. 

 Phosphuretted fat in blood-corpus- 

 cles, 85, 90. 

 Phrenology, 535-37- 

 Physical forces, relation of life to, 



9-15- 



Physiology, definition of, I. 

 Pia mater, circulation in, 192. 

 Pigment, 48. 



of choroid coat of eye, 638. 



composition of, 50. 



of hair, 382, 431. 



Pigment, continued. 

 of skin, 422. 

 uses of, 50. 



Pigment-cells, form of, 35, 49. 

 Pineal gland, 539. 

 Pinna of ear, 672. 

 " Pins and needles," sensation of, 



481. 



Pitch of voice, 619. 

 Pith of hair, 431. 

 Pituitary gland, 539. 

 Placenta, 750. 

 formation of, 754. 

 foetal and maternal, 759. 

 relation of to the liver, 333. 

 structures composing, 759. 

 Plants, 



distinctions from animals, 6. 

 heat evolved by, 249. 

 Plastic food, 255. 

 Plexuses of nerves, 472. 



terminal, ib. 



conduction through, 585. 

 of spinal nerves, relation to cord, 



494. 



Pneumogastric nerve, 557. 

 distribution of, 558. 

 mixed function of, ib. 

 influence on action of heart, 142. 

 on deglutition, 273. 

 on digestion, 300. 

 on functions of larynx, 559, 



560. 



of oesophagus, 560. 

 of lungs, ib. 

 of pharynx, 559, 560. 

 on movements of stomach, 301. 

 on respiration, 515, 561. 

 on secretion of gastric fluid, 



300, 301. 

 on sensation of hunger, 298. 



of thirst, 299. 

 origin of from medulla oblongata, 



5I5- 

 Poisoned wounds, absorption from, 



. 378- 



Poisons, absorption of from intes- 

 tines, 376. 

 narcotic, introduced in stomach, 



300. 



Polarity of muscles, 596, note. 

 Polygamous birds, their cerebella, 



530. 

 Pons Varolii, its structure, 519. 



