INDEX 
References 
Starfish — Continued 
enemy of oyster.173 
family.169 
summary of.174 
State Department of Health 508 
Statistics of life insurance com¬ 
panies .478 
Steam, a form of water ... 10 
Steapsin, a ferment .... 412 
Steering, use of fins for ... 72 
Stegomyia, a mosquito ... 55 
Stem, of conifer.341 
of corn.267 
of ferns.334 
of mosses. . 328 
of xerophytes, green color of . 371 
Stems, discussed.260 
Sterile, defined.313 
Sterile hairs, of moss plants . 329 
Sternum, keeled, of birds . . 109 
Sticklebacks, nests of ... . 80 
Stigma, part of pistil .... 198 
feathery.210 
Stimuli, causing movement 290, 369 
list of. 6 
Stinging cells of ccelenterates . 160 
Sting of bee.46 
Stipules, of pulse family . . . 299 
part of leaf.276 
Stock.271 
Stolon.271 
Stomach, a digestive organ . . 86 
example of organ .... 7 
of man.408 
of starfish, use of, in food¬ 
taking .171 
valves of.408 
Stomach-intestine of earth¬ 
worm .181 
Stomata, number of ... 288 
in xerophytes.371 
of leaf.285 
position of, in waterlilies . . 287 
Stoneflies, members of Plecop- 
tera.29 
Stone fruits, defined .... 239 
Stone of drupe.239 
Stones, inorganic matter . 10 
wet by spray, habitat of 
mosses.328 
Storage of food in leaves 279, 293 
35 
are to pages 
Straight-veined leaves of beech 
family.297 
Stramonium, a medicine, source 
of.300 
Strap-shaped flowers .... 206 
Strawberry, description of . . 240 
produced by rose family . . 298 
Stream purification .... 462 
Street cleaning by flushing, 
advantage of.461 
String beans, value of, as food . 222 
“ Strings ” of celery .... 266 
Strobili, of pine.343 
staminate.343 
Structural changes due to 
alcohol.481 
Structure, of amoeba .... 143 
of bone.436 
of leaf.285 
of paramecium.146 
of pollen grain.208 
of roots.247 
of vascular bundle .... 266 
of woody stems.267 
Student report, on sickness . . 487 
on skeletal structures . . . 436 
on water supply.499 
Studies about plants, kinds of 
374-378 
Study of an apple.236 
Study of an orange .... 234 
Study of a tomato.235 
Study of lichens, field trip for 326 
Study of plants as organisms . 195 
Study of variation in wheat 529 
Style, part of pistil .... 198 
Substitutes for sugar .... 421 
Substitutes for butter .... 421 
Success in cultivating plants 376 
Suet, for winter feeding of birds 117 
station.118 
Suet-eating birds.118 
Suffocation, discussed .... 447 
Sugar, a nutrient.13 
broken up by yeast enzyme 
321, 427 
form of carbohydrate . . . 416 
in flour.• 427 
lessens fatigue.440 
obtained from maple trees . 351 
organic matter.10 
