xv iii LIST OF ILLUSTRATIONS 



FIGURE PAGE 



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 



