xvi 



LIST OF WOODCUTS. 



288. Liver of hnman germ . 342 



289. Nail-tissue . . .362 



290. Intestinal epithelium . 362 



291. Jelly-like tissue . . 363 



292. Cartilaginous tissue . 363 



293. Neuro-umscular cells . 364 



294. Nerve-tissue . . .364 



295. Muscle-tissue . . .364 



296. Vascular tissue . . 365 



297. Blood-cells . . . 365 



298. Blood-vessels of a Worm . 371 



299. Head with blood-vessels 



of Fish. . . . 375 

 300-302. Arterial arches . 377 

 303-306. . 378 



307-310. Development of the 



heart . . . .380 

 311-314. Development of the 



heart . . . .382 

 315. Transverse section 



through Haliphysema . 393 



316. Rudiments of Urogenitalia 400 



317. Primitive kidney of Bdello- 



stoma .... 406 



318. Earliest primitive kidney 



rudiments . . . 408 



319. 320. Primitive kidneys of 



Mammals . . . 409 

 321. Development of urogeni- 



tal system . . . 414 

 322,323. 415 



324-326. 416 



327. Female sexual organs of 



Beaked Animal (Orni- 

 thorhynchus) . . 418 



328. Change of position of both 



kinds of sexual glands 

 i in human beings . . 420 



329. Development of the hnman 



external sexual organs 422 



330. Human egg-follicles . 426 



