xviii LIST OF ILLUSTRATIONS 



FIGURE PAGE 



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



206. 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 



