INDEX 



521 



Equipotential system, 278 



Equus, 363, 364; See: Horse 



Erepsin, 155 



Erosion of soil, 419 



Esophagus, 103, 146-149, 151-153 



Ethics, 5 



Eugenics, 314, 422-424 



Euglena, 50, 411 



Euplotes, 54 



Euspongia, 69, 70 



Eustachian tube, 213, 357 



Euthenics, 314, 423 



Eutheria, 128-131, 479 



Evolution, 4, 131, 321, 348-385, 388, 



459, 471-476 

 Exconjugant, 256, 257 

 Excretion, 25, 37, 39, 61, 134, 154, 



180-187 

 Excretory system, 65, 164, 180-187 

 Exopodite, 106, 107 

 Exoskeleton, 96, 104, 105, 138, 145 

 Experimental method, 2, 219, 274, 



452, 468 

 Eye, 79, 81, 82, 90, 93, 104, 105, 210, 



213-217, 330, 357; brush, 332; 



color, 287 

 Eyelid, 215, 357 



Fabricius, 466 



Fallopian tube, 193, 194; See: Oviduct 



Family, 352, 353 



Fang, ^358 



Fat, 22, 23, 36, 39, 151, 155, 156, 157, 

 159 



Fat body, 190 



Fatty acid, 22, 151, 156, 181 



Feather, 97, 111, 123, 124, 134, 138 



Feather star, 85, 86 



Feces, 159, 180 



Feeble-minded, 421 



Female, 57; See: Egg and Sex 



Femur, See: Vertebrate and Bee 



Fermentation, 40, 41, 221, 389, 390 



Fern, 361 



Fertilization, 55, 57, 230, 231, 243, 

 249-262, 305, 340, 383, 468; signifi- 

 cance, 255-262 



Fibula, 142, 144 



Fiddler crab, 91 



Fig, 416 



Filaria, 80 



Filial regression, 380 



Filterable virus, 343 



Fin, 110, 112, 133, 142, 143, 146, 270 



Fire, 433, 439, 443 



Fish, 111, 112-117, 146, 161, 173, 

 184, 194, 204, 212, 336, 359, 418, 

 420 



Fission, 230, 233; See: Binary fission 



Fixity of species, 350; See: Evolu- 

 tion 



Flagellate, 477; See: Euglena, Mas- 

 tigophora 



Flagellum, 28, 39, 51, 58, 59, 68, 69 



Flatfish, 115 



Flatworm, 78, 79, 233, 235, 396-400, 

 477 



Flea, 93, 94, 402, 405, 406 



Flight, 124 



Flipper, 355 



Flounder, 115 



Flower, 334 



Fluctuations, 379 



Fluke, 78, 396-398 



Fly, 219, 407-409, 411, 415 



Flying dragon, 122 



Flying-fish, 115, 116 



Flying lemur, 322, 324 



Flying squirrel, 321 



Follicle, cells, 239; hair, 134 



Food, 14, 26, 31-33, 36, 159, 221, 317, 

 318, 335, 336, 403-407; See: Me- 

 tabolism and Nutrition 



Foodstuffs, 23, 32-36 



Foot, 140, 431; See: Limb 



Foraminifera, 48, 49, 386, 387, Ml 



Fore-brain, 201, 202, 215, 268, 269 



Forest conservation, 404, 412, 418 



Formaldehyde, 32 



Fossil man, 431-437 



Fossils, 83, 358-364, 431-437, 459 



Fossorial, 32 1, 322 



Four-o'clock, 297, 298 



Fox, 321, 325, 326 



Free-martin, 306 



Fresh- water sponge, 69, 70 



Frog, 7, 111, 111-119, 181, 184, 325; 

 circulation, 147, 173, 365; embry- 

 ology, 267-271; intestine, 147, 155; 

 metamorphosis, 267-271; muscular 

 system, 136; nervous system, 204, 

 205; pancreas and liver, 155; respir- 

 atory mechanism, 165; skeleton, 

 141; urogenital system, 190, 239 



Fructose 22 



Fruit fly,' 305, 306, 309, 311, 411 



