IK) INDEX. 



the period of life, 336, Recumbent posture on an inclined plane, neces- 

 sary, especially to old people, 357. Of motions of progression 5 of 

 walking, 358. Of walking up or down an inclined surface, 360. Me- 

 chanism of the articulation between the leg and foot, 361. Of running, 

 362. Of leaping, 363. Leaping- is performed by the sudden extension 

 of the lower extremities, previously in a state of flexion, 634 365. Of 

 the vertical and oblique leap, 365. Of swimming; man swims with dif- 

 ficulty, 365. Swimming natural and easy to fishes ; its mechanism, 367. 

 Of flying, 368. The structure of the body in birds favourable to this ac- 

 tion; how performed, 369. Of crawling, 371. All the phenomena of 

 animal mechanics may be referred to theory of the lever of the third 

 kind, 370. Partial motions performed, by the upper extremities, 360. Of 

 climbing; of pushing, 360. Of throwing a projectile, 360. Partial mo- 

 tions, as signs expressive of ideas; of gestures and attitudes, 369. 



CHAPTER IX. 



Of Voice and Speech, 370. 



Definition of the voice and of speech ; circumstances necessary to the 

 formation of the voice ; its organs, 371. Opinions of Ferrein and Dod- 

 art, on the uses of the glottis, 371. The larnyx is, at once, a wind and 

 a stringed instrument, 372. Of the power of the voice 5 of speech ; man 

 alone is capable of speech, 373. Of the vowels and consonants, 374. Of 

 song and music, 375. Of stammering, burr, and dumbness, 375. In- 

 struction of the deaf and dumb, 376. Ventriloquism, 52 1. 



SECOND CLASS. 

 CHAPTER X. 



Functions subservient to the preservation of the Species. 

 Of Generation) 381. 



Difference of the sexses, 381. Case in which the sexual organs did not 

 exist, 381. Hermaphrodism is never met with in the human species, 383. 

 Man, in the exercise of the functions of generation, not under the control 

 of the seasons, 384. Of the organs of generation, in man, 384. Of the 

 female organs of generation, 386. Of the signs of virginity, 387. 



Of erection, 386. Of the human semen, 388. Of the ovaria, 390. Of 

 the impregnation of the ovum, 393. Of barrenness, 394. Systems of ge- 

 neration, 394. Gestation, 397. Of the foetus and its coverings, 400. 

 Of the development of its organs, 400 40 1 . Of circulation of the blood, 

 in the foetus, 40 1 . Of the placenta, 40 1 402. The umbilical cord, 404. 

 Mode of existence of the foetus, 405. Morbid affections to which it is 

 subject while in the womb, 406. Of monsters, 407. Their different kinds, 

 and the causes which produce them, 408. History of a remarkable case, 

 409. Of the chorion, of the amnion and liquor amnii, 409. Of the allan- 

 tois and urachus, 410. Of the natural term of gestation, 412. Of par- 

 turition, 412. Of the mechanism of parturition, 413. Of twins, 413. The 

 number of male children born exceeds that of temale, 414. Of superfce- 



