32 
INDEX 
References are to pages 
Scutejlum, digestive organ 
of 
Selective cutting of forests . . 
362 
corn grain . . . 4 
225 
Self-pollination, discussed . . 
211 
modified cotyledon . . 
225 
preyention of. 
211 
Scutes of snake.... 
101 
Self-protection of earthworms . 
183 
Sea-anemone, described . 
166 
Semi-circular canals of ear . . 
475 
member of ccelenterates 
160 
166 
Sensation, a life process . . . 
5 
Sea-cucumber, member 
of 
Sense organs, list of ... 
472 
echinoderms . . . 
169 
of touch, location of . . 
472 
Sea-fans, described . . 
160, 167 
Senses, use of, in grasshopper . 
25 
member of coelenterates 
160 
Sensitive plants. 
291 
Sea-lily, member of echinoderms 
169 
Sensory function of afferent 
Sealing, object of . . . 
313 
nerves . 
471 
Seals. 
526 
Sepals, described ..... 
198 
Sea-plumes, described . 
167 
Sepia, described. 
192 
Sea-turtle. 
100 
Serrate edge of leaf .... 
278 
Sea-urchins, classified . 
8 
! Serum. 
511 
members of echinoderms . 
8 
Seta of moss sporophyte . 
330 
Sea-weed, removal of, from 
Setae of earthworm .... 
179 
oyster beds. 
173 
Setting of bones. 
435 
Sea-worm a true worm . . 
175 
Setting-up exercises .... 
440 
Secretions of sundew, use of 
367 
Seventeen year locust (cicada) 
33 
Seed, development of . 
219 
Severe cold, effect of, on 
distribution of ... 
240 
plants. 
373 
of pine. 
344 
Sewage, improper care of 
461 
of strawberry. 
240 
Sexual reproduction . . 157, 307 
Seed-bearing plants, a group 
of hydra. 
163 
of plants. 
9 
of spirogyra. 
305 
Seed bud (plumule) . . . 
221 1 
Sexual spore. 
307 
Seed coat (testa) . . 
219, 
220 
Shad, example of bony fish . 
71 
“ Seed ” corn. 
245 
raised in hatcheries .... 
78 
Seed dispersal. 
240 
Shade trees. 
364 
Seed-eating birds . . 
116 
Shaft of bone. 
436 
bills of. 
109, 
116 
Shaggy cap or cover of moss 
claws of. 
108 1 
capsule . 
328 
Seedless plants, a group 
of 
Shape and size of bacteria . . 
309 
plants. 
9 
Sharks, a division of fishes . 
79 
Seedling, defined . . , . 
221 
Sharp-shinned hawk, partly 
Seed-producing organs of pine . 
343 
harmful. 
115 
Seed selection. 
231 
Sheep . 
132 
Seed wheat. 
245 
example of mammal 
9 
Seeds, of berries 
241 
Shell of slug .... 
185 
devices for distributing 
238, 242 
of snail. 
190 
food of birds. 
116 
Shepherd’s purse, a weed . . 
223 
improvement in, by cross- 
Shrews destroyed by hawks 
115 
pollination. 
390 
Shrike (great northern), a win¬ 
of cotton. 
222 
ter visitant. 
112 
of weeds. 
223 
Shrimps. 
526 
Segments. 
175 
Sickness, student report on 
487 
Selaginella, member of fern 
Sieve plates .... 
267 
group. 
337 
Sieve vessels of phloem . . . 
267 
Selection. 
390 
use of. 
269 
