xviii LIST OF ILLUSTKATIONS 



265. Three early stages in the histogenesis of the skin . . . 270 



266. From a section of the abdominal integument of an infant . . 272 



267. Several coils of a sudoriparous gland of the human finger . . 273 



268. Terminal phalanx of finger of human fetus .... 275 



269. Transection through the margin of a finger nail .... 276 

 270. Longitudinal vertical section of the young nail and nail-bed of an 



infant . .277 



271. Five stages in the development of a human hair . . . 278 

 272. From a section of the skin of an infant's arm, showing small im- 

 mature hair follicles in transection 280 



273. From a section of the human scalp 282 



274. Transection of a hair near the middle of the root sheath . . 284 



275. Regeneration of a hair 287 



276. Sebaceous glands in the scalp of a child 288 



277. Section of a sebaceous gland from the human scalp, through point 



of opening into a hair follicle (obliquely cut) .... 289 

 278. Cells from the central portion of figure 277, showing two successive 



stages in sebum formation by process of fatty metamorphosis of 



the cytoplasm .... .... 289 



279. Reconstruction of the cutaneous blood vessels .... 290 



280. Photograph of Azoux model, showing nostril, pharynx, larynx and 



related structures ........ 292 



281. From a section of the mucous membrane of the respiratory region 



of the human nose ........ 294 



282. The olfactory mucosa of a cat ....... 296 



283. The olfactory mucous membrane ...... 297 



284. Vertical section of the olfactory mucosa of a kitten . . . 298 

 285. Diagram of the relations of the neurons of the olfactory nerve and 



olfactory bulb . 299 



286. A vertical section through the lateral wall of the human larynx . 301 



287. Transection of the wall of a child's trachea .... 302 

 288. Mucus-secreting, tubulo-alveolar gland of the human tracheal 



mucosa .......... 303 



289. A bronchus from the human lung ...... 305 



290. Diagram of primary lobule of lung (lung unit) .... 307 



291. From a section of a child's lung ...... 308 



292. From a section of a child's lung ...... 309 



293. From a section of a child's lung ...... 310 



294. Diagram of the three pulmonary lobules connected with a terminal 



bronchiole .311 



295. Two alveoli of a child's lung .... .312 



296. Transection of the pleura of an infant . . . . .313 

 297. From a section of the pleura of man . . ' . . . .313 



