INDEX 





R( u /■< noes 



Seeds, continued 



of cotton ( fig. | 313 



of weeds 



Selaginella (tig.) ;,7} 



member of tern group .... 373 



Selection, effect on wild plants 320 



Self-heal (fig.) ;;;;;; 



Self-pollination, discussed . . 306 



prevention of 306 



Semi-circular canals of ear . 218 



Sensation, a life process ... 2 



Sense organs, list of ... . _'ir. 



of touch, locution of ... . 190 



Senses, use of 2 



Sensory function of afferent 



nerves 213 



Sepals, described 296 



Sepia, described 100 



Septic sore throat, epidemic <»f 



(fig.) 243 



Serrate edge of leaf of Rose 



family 328 



Seta of moss sporophyte . . 366 

 Setae of earthworm .... B0 

 Seventeen year locust (ci- 

 cada) 



Severe cold, effect of on plants 396 



Sewage, improper can- of . . 'JIT 

 Sexual reproduction .... 



of hydra 66 



of spirogyra 341 



Sexual spore :;ii 



Shad, example of bony tisli . . Hx; 



raised in hatcheries . . . . Ill 

 Shaggy cap or cover of moss 



capsule :^;i 



Shape and size of bacteria 343 



Sharks, a division of fishes , . 106 

 Sharp-shinned hawk, partly 



harmful 146 



Sheep, economic value of 154,166 



example of mammal .... 7 



fed on beans 316 



stomach of (fig.) 164 



Shell of slug 99 



Shells of snail (liii) .... 99 

 Shrews destroyed by hawks l \:> 

 Shrike (great northern), a win- 

 ter visitant Ill 



loggerhead (tig.) 139 



ill'i tO /nil/' s 



Shrimp.s, economic Importai 



of 



Sickness, student report on . 

 Sieve vessels of phlotfm 



use <d 



Silica in skeleton of sponge 61 

 Silique of mustard ly 



(fruit i 



Silk of corn, attachment of 



t he Btyle 



Silkworm, a beneficial insect . 

 Simple leaf (fig.) 



of beech family 



defined 



Sinus, defined 



Siphonaptera, an order ol ln« 



sects 20 



Siphons of clams Mi_. i . . 

 Siphons of soft-shell- rn 



(fig.) 100 



Skating, good exercise . . . 

 Skeletal structures, student 



report on 187 



Skeleton, external, of corals 



of crayfish 



of dog (fig.) ; 



of fish (fig.) I 



of leal (fig.) 



Of mallard duck (fig | . . . . 



Of man (fig.) 184 



summary ol .... r«> 



of protozos 



of sponges (fig.) . . • "■'•. 'd 



Skill and endurance ii: >d 



by drink (fig.) 



Skin, as sense organ ... 



described . 216 



diagram of (fig.) 



example i in 



of fruit 



Skunk, example of harmful 



mammal ( ti^.i . . 

 Sleep, amount needed . . 

 Sleeping sickness how »pn id 



probable cause of . . . 

 Slimy feeling of spirot • 

 Slimy substunc. | ipoo 



r< nio\ ed h\ b 

 Blips producing 



roots '"1 



