38 



INDEX 



References are to pages 



Steam heating (fig.) . . 195, 197 



Steering", use of fins for . . . 107 



Stegomyia, a mosquito ... 42 



Stem, of bean 260 



of corn (fig.) 280 



of ferns 369 



of mosses 364 



of pteris (fig.) .... 369, 370 



of xerophytes, green color of . 396 



woody (fig.) 289 



Sterile, defined 347 



Sterile hairs, of moss plants . 365 

 Sterilized -water in tests for 



bacteria 347 



Sternum, keeled, of birds . . 138 



Sticklebacks, nests of ... . 112 



Stigma, part of pistil .... 297 



featbery 305 



Stimulant, craving for ... 226 



Stimuli, causing movement . . 392 



list of 2 



Stinging- cells of coelenterates 64 



Sting of bee .' . 36 



Stipe, of fern 373 



Stipules, of pulse family . . . 329 



of rose leaf (fig.) 331 



Stomach, a digestive organ . . 2 



example of organ 5 



microphotograpb of ... . 170 



of sbeep (fig.) 154 



of starfish, use of in food- 

 taking 73 



pear-sbaped (fig.) 168 



valves of 168 



Stomach-intestine of earth- 

 worm 81 



Stomata, entrance of bacteria 



tbrougb 315 



number of 274 



in xeropbytes 396 



of fern 373 



of leaf 273 



position of in waterlilies . 274, 394 



size of 274 



Stonefhes, members of Plecop- 



tera 20 



Stone fruits, defined .... 310 



Stone of drupe 310 



Stones, inorganic matter ... 10 



wet by spray habitat of mosses 364 



Storage of food in leaves . . 293 

 Straight-veined leaves of 



beech family 327 



Stramonium, a medicine, source 



of 331 



Strawberry, description of . . 310 



produced by rose family . . . 329 



value of as food 178 



Street cleaning by flushing, 



advantage of 235 



String beans, canning of . . . 317 



ovules in 309 



value of as food 317 



Strobili, of pine 379 



staminate (fig.) 377 



Structural changes due to 



alcohol 225 



Structure of amoeba .... 47 



of paramoeciurn 50 



of roots 267 



of woody stems 287 



Struggle for existence, dis- 

 cussed 314 



modifications aiding in . . . 389 



Student report, on sickness . 232 



on skeletal structures . . . 187 



on water supply 242 



Studies about plants, kinds 



of 311 



Study of lichens, field trip for 362 



Study of plants as organisms . 320 



Style, part of pistil 297 



Success in cultivating plants 320 



Sucking disks of starfish . . 73 



Suction in photosynthesis . 276 



Suet, for winter feeding of birds 148 



station 148 



Suet-eating birds 148 



Suffocation discussed . . . 196 



Sugar, a nutrient 1 



broken up by yeast enzyme . 354 



elements in 9 



form of carbohydrate .... 265 



in flour 179 



obtained from maple trees . . 385 



organic matter 10 



product of photosynthesis . . 276 



solution in study of spirogyra 341 



source of 400 



value of as food 178 



