ANALYSIS OF THE LESSONS. XV 



LESSON XXVI. HAIR, p. 77 



420. Structure of Hair : the Jjiyers of which it consists. 421. The cortical 

 substance. 422. The medullary substance. 423. Difference between feathers and 

 hair. 424. Vascularity of feathers. 425. Structure of a feather illustrated and 

 explained. 426. Cuticle of human hair : its composition. 427. How attached. 

 428. Shaft of a hair. 429. Epidermic scales removable : illustration. 430. 

 Action of Caustic Potash and Soda on cortical substance : pigment granules : 

 air. 431. Scales of the root of hair, illustrated. 432. Structure of medulla : 

 action of caustic soda upon it : air contained in it : illustrated. 433. Air de- 

 monstrated in the shaft of human eye-brow, illustrated. 434. Transverse sec- 

 tions of human hair described and illustrated. 435. Elasticity of hair : absorp- 

 tion of moisture. 436. Chemical composition of hair. 437. Structure of Wool : 

 Browne's comparison of a. Negro's hair and wool : his statements examined. 

 438. These opinions refuted. 439. Hair of Negro, illustrated : Hair of Indian, 

 illustrated. 440. Hair of beard. 441. Why the hair of the Indian and Negro 

 should be stronger and coarser than hair of a white man. 



LESSON XXVII. HAIR, CONCLUDED, p. 83 



442. Importance of a knowledge of the structure of Hair. 443. Vascularity 

 of follicle of feline animals. 444. The structure of transverse sections of vi- 

 .brissae : Tiger and Cat. 445. Importance of vibrissae to the feline animals. 

 446. Their use. 447. An experiment. 448. Value of transverse sections of 

 hair. 449. Vibrissae, Rat and Raccoon ; air in the medulla. 450. Pachyder- 

 matous (thick-skinned) animals : plurality of medullary canals : hair of the Ele- 

 phant's tail, illustrated. 451. Hair of the Elephant's proboscis and Hog's bristle 

 compared. 452. Structure of whalebone : hair from the mane of the Horse an 

 exception to the pachydermatous rule. 453. Hair of the Turkey. 454. Hair 

 of the Ruminantia : cellular structure of the Stag's hair explained and illustrated : 

 Wapeti Deer. 455. Ooat's hair : comparison. 456. Hair of Ornithorhyncus 

 paradoxus : its peculiarity explained. 457. Quill of the Porcupine described 

 and illustrated : its affinity to hair. 458. Quill of English Hedgehog described 

 and figured. 459. Quill of the American Porcupine : the difference of structure 

 explained. 460. Imbrications on the hairs of animals. 461. Hair of the Seal 

 described and illustrated. 462. Mouse hair, its peculiarities : hair of Phasco- 

 gale pennicillata. 463. Hair of Indian Bat. 464. Remarkable hair of Aphro- 

 dita hispida. 465. Curious hair of Dermestes lardarius. 466. Hairs of the 

 larva described. 



LESSON XXVIII. EPITHELIUM. SEROUS AND SYNOVIAL MEMBRANES, . p. 93. 



467. Epidermis and Epithelium compared. 468. Where found. 469. Form 

 of cells. 470. Tessellated or pavement epitheh'um. 471. Nucleus in cells. 

 472. Cylinder epithelium. 473. How to see the cylindrical cells. 474. Cylinder 

 epithelium : where found. 475. Ciliated epithelium : where found. 476. Action 

 of epithelium : its continuance after death. 477. This phenomenon not confined 

 to man. 478. Ciliated epithelium of the Frog : how seen. 479. Ciliated epi- 

 thelium, from the drum of human ear. 480. Epithelium, like epidermis, ex- 



