INDEX 
37 
References 
Temperature, of birds . . . 110 
of fish.75 
of soil, an element of success 
in agriculture.223 
Tendon.438 
Tendrils, of pea plant . . . 290 
response of, to contact . . 369 
Tennyson, quotation from . . 379 
Tentacles of hydra.160 
Tent caterpillar.41 
Terminal bud.264 
cones in relation to . . . . . 345 
Ternately compound leaves . . 277 
Terrapin, use of, as food . . . 100 
Testa developed from integu¬ 
ment .219 
Testing seed.231 
Tests in bakeries and brew¬ 
eries .321 
Thalessa, larva of.51 
Thallophytes, classified ... 9 
Thallus of marchantia . . . 330 
Thickened fibrous roots . . 251 
Thick stems for food storage 261 
Thick-walled cells of annual 
ring, how formed .... 266 
Thigmotropism, discussed . . 286 
Thinning and transplanting 
seedlings.232 
Thin-walled cells, when formed 266 
Thistle, a common weed . . . 301 
Thoracic cavity.452 
Thoracic duct.414 
Thorax, of grasshopper ... 23 
Thorn, modified leaf .... 290 
Thorns.290 
Thousand-legged worms ... 66 
Thread-like hairs, of spirilla 
and bacilli.309 
Threads, of bread mold . . . 323 
of spirogyra.306 
Throat cavity of man .... 406 
of tadpole.92 
Thyme, a member of mint 
family.300 
Thyroid extract, use of . . . 504 
Thyrse.214 
Tibia, of grasshopper .... 24 
Tickle-grass.242 
Ticks, harmful insects ... 65 
members of Arachnida . . 66 
are to pages 
Tigers, harmful animals . . . 137 
Timbers of mines, use of gym- 
nosperms for.346 
Tissue. 7 
definition of. 7 
Tissues of fern.334 
Toad, horned.101 
Toadfish.79 
Toads, hibernation of . . . 84, 97 
Toadstools, example of fungi . 9 
Tobacco, effects of use of . . 482 
inhaling fumes.484 
member of nightshade family 300 
Tobacco worm, cocoons of 
parasite on.40 
Toes of cow, rudimentary . 126 
Tomato, a dicotyledon . . . 227 
food plant of nightshade 
family.301 
worms, larvae of sphinx moth 44 
Tongue, a sense organ . . . 404 
of man.404 
of snail.190 
Toothache, result of poor teeth 407 
Tortoise, use of, as food . . 100 
Toxin, bacterial poison . . 311 
of diphtheria.511 
secreted by bacteria . . . 311 
Trachea, of man.444 
of grasshopper.22 
Transient birds, examples of . 112 
Transpiration, defined . . . 282 
amount of water given off by . 284 
devices for retarding . 283, 371 
laboratory work on . . . . 284 
Trap-like device of Venus’s 
flytrap.367 
Tree sparrow, at bread crumb 
station.118 
Trees, habitat of lichens . . . 325 
Tremex borer, harmful insect . 51 
Trench fever.514 
Trichina, discussed . . . . 176 
Trichinella, discussed .... 176 
Trichinosis, cause of ... 177 
Trichocysts of paramecium . . 146 
Trillium, picking of .... 395 
Trochanter.24 
Tropical regions, first home of 
man.400 
home of epiphytes .... 373 
