446 



INDEX 



Sleeping rooms, ventilation of, 184- 



185. 

 Sleeping sickness, 283. 

 Sludge, disposal of, 305. 

 Smallpox, 269, 282 ; 



vaccination, 271, 274, 407, 408. 

 Smell, sense of, 203. 

 Smuts, 337. 

 Snail, 242. 

 Snakes, 246; 



destructive, 366; 



useful, 358; 



venoms, 272, 274. 

 Social inheritance, 395. 

 Society, lessons of biology, 6. 

 Soil, capacity for holding water, 65 ; 



composition of, 10, 63-65 ; 



erosion of, 314; 



fertihzing, 341-343 ; 



inorganic and organic, 64. 

 Soil water, 65. 

 Solar engines, 79. 

 Solutes, 9. 

 Solution, 9. 



Sound, character of, 205. 

 Sparrow, 360. 



Spawning, of fishes, 372-373. 

 Species, 234 ; 



new, 383, 385. 

 Specific disease, 260. 

 Sperm 223, 224, 226, 227. 

 Sperm cell, 226, 227; 



development, 381, 382, 383. 

 Spermatophytes, 237. 

 Spices, adulteration, 139. 

 Spider, 28, 241. 

 Spinal cord, 199, 100. 

 Spine, curvature of, 115. 

 Spiracles, of insect, 26. 

 Spirillum, 96, 256. 

 Spirochsetes, 282. 

 Spirogyra, 223. 

 Spleen, 156. 



Split proteins, 261, 271, 272. 

 .Sponges, 239, 355. 

 Spongy tissue, of leaf, 772. 

 Sporangia, 222. 

 Spores, asexual, 222, 223, 228 ; 



sexual, 223. 

 Sporozoa, 239. 



Sports, 385. 

 Sprengel, Conrad, 35. 

 Squid, 242. 

 Stamen, 32. 

 Staphjdococci, 266. 

 Starch, 53 ; 



changed to grape sugar, 59, 60 ; 



digested in plants, 91 ; 



digestion by man, 149, 154, 155 ; 



fuel value, 119-120; 



grains, 60, 129 ; 



made bv green leaves, 81-84; 



test for^ 53, 54. 

 Starch making, 81, 82, 84. 

 Starfish, 241 ; 



food of, 361; 



regeneration, 220. 

 Statocysts, 197. 

 Stems, dicotyledonous, 87, 88, 90; 



food of man, 324 ; 



monocot^dedonous, 89, 90, 91; 



passage of fluids, 75, 91 ; 



passage of food, 89 ; 



rise of water in, 91 ; 



structure of, 87-91. 

 Sterihzation, 2-54, 256, 258. 

 Sterilizer, 254. 

 Stigma, 32. 

 Stiles, Dr. C. W., work on hookwoim, 



289. 

 Stillman, Dr. E. G., cited, 142. 

 Stimulants, 139. 

 StimuK, 15; 



of plants and aniiTxals, 192, 193, 

 195. 

 Sting, 26. 

 Stipules, 76. 



Stockard, Dr., cffced, 141. 

 Stomach, 153, 154. 

 Stomata, 76, r7. 

 Streaming of protoplasm, 46. 

 Street cleaning, 306, 307. 

 Streptococci, 113. 

 Sturgeon, 374. 

 Style, 32. 



Sublingual gland, 149. 

 Submaxillary gland, 149. 

 Substance, defined, 8. 

 Succus entericus, 157. 

 Sucrase, 157. 



