658 



INDEX. 



Seps, i. 458. 



Series of organic beings, i. 53. 

 Serous membranes, i. 102. 

 Serpents, i. 447; ii. 129, 163, 



390. 

 Serpula, i. 277 ; ii. 295. 

 Serves, ii. 609, 617. 

 Sertularia, i. 165; ii. 234. 

 Serum, i. 102. 

 Sesamoid bones, i. 406. 

 Setee, i. 274. 

 Shark, ii. 162, 205, 262, 495, 



569, 587, 598. 

 Sheep, ii. 153, 194, 402, 

 Shell, i. 111,230. 

 Sheltopusic, i. 457. 

 Shrapnell, ii. 426. 

 Shrew, ii. 149, 391. 

 Shuttle bone, i. 517. 

 Silica, ii. 18, 44. 

 Silk worm, i. 305; ii. 59. 

 Silurus, ii. 307, 390. 

 Sinistral shells, i. 243. 

 Siphonaria, i. 252. 

 Siren, i. 457; ii. 274, 324. 

 Skate, ii. 303, 410, 495. 

 Skeleton, i. 365, 386. 

 Skeleton, vegetable, i. 95 ; ii. 42. 

 Skimmer, ii. 132. 

 Skin, ii. 377. 

 Skull (see Cranium). 

 Slack, i. 66. 

 Sleep, ii. 536. 



Slips, propagation by, ii. 585. 

 Sloth, i. 481, 498, 524; ii. 284. 

 Slug, ii. 126, 317. 

 Smell, ii. 396. 

 Smith, ii. 166. 

 Snail, ii. 317, 413,587. 

 Snake-lizard, i. 448. 

 Snout, i. 521. 

 Snow, red, i. 16. 

 Soemmerring, ii. 575. 

 Soils, fertility of, ii. 18. 

 Solar light, ii. 31. 

 Solen, i. 222, 224. 

 Solipeda, i. 516. 

 Solly, ii, 354. 



Sorex, ii. 135, 443, 505. 

 Sound in fishes, i. 429. 

 Sound, ii. 414. 

 Spallanzani,i. 62; ii. 79, 170, 



183, 338, 567, 614. 

 Spatangus, i. 205, 211. 

 Spectra, ocular, ii. 525, 530. 

 Spectre of the Brocken, ii. 533. 

 Speed of quadrupeds, i. 496. 

 Spermaceti, i. 484. 

 Spherical aberration, ii. 471. 

 Sphincter muscle, i. 136. 

 Sphinx, ii. 217, 244,547. 

 Spicula, in sponge, i. 154. 

 Spider, i. 282, 284 ; ii. 248. 

 Spider-crab, ii. 545. 

 Spider-monkey, i. 399, 534. 

 Spine, i. 387, 392. 

 Spinal cord, or Spinal marrow, 



ii. 553, 604. 

 Spiracles, ii. 311. 

 Spiral threads in plants, i. 68. 

 Spiral vessels, i. 73. 

 Spiral growth of plants, i. 90. 

 Spiral valve in fishes, ii. 205. 

 Spirits, animal, ii. 563. 

 Spirula, i. 242, 265. 

 Spix, ii. 252. 

 Spleen, ii. 224. 

 Splint bone, i. 517. 

 Spokes, curved spectra of, ii. 



524. 

 Sponge, i. 147 ; ii. 84. 

 Spongiole, i. 79; ii. 20, 21. 

 Spotted cells of plants, i. 69. 

 Spring-tail, i. 297. 

 Spur of cock, i. 586. 

 Squalus (see Shark). 

 Squalus pristis, ii. 166. 

 Squirrel, i. 524, 550; ii. 178. 

 Stability of trees, i. 81. 

 Stability of human frame, i. 541. 

 Stag, skeleton of, i. 507. 

 Stamen, ii. 596. 

 Stapes, ii. 426. 



Star-fish, i. 200 (see Asterias). 

 Starch, i. 70; ii. 41. 

 Staunton, ii. 531. 



