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 Duckbill, 196.

Dust, 82, 158.

Ear, of bird, 151; of frog, 131; of fish, 112; of man, 154.

Earthworm, 42.

Echinoderms, 9, 34, 125.

Ecology, 14,  9.

Economic importance of birds, 167; insects, 93; mollusks, 105; rodents, 206.

Ectoderm, 26, 87.

Ectoplasm, 11, 14.

Egg, of insect, 81; of hen, 95, 96, 112.

Elaters, 198.

Element, viii.

Embryo, 26, 180.

Embryo sac, 180.

Enamel, 98.

Endoderm, 26, 27, 37.

Endodermis, 44.

Endoplasm, 11, 14.

Endosperm, 21, 24.

Energy, 96, 140; in ameba, 12; organic, 2, 3; plant, 2, 3, 5.

Entomophilous, 148.

Environment, 6,  148,  2, 3, 4, 48.

Enzyme, 100.

Epicotyl, 23, 25.

Epidermis, of leaf, 86, 87; of man, 17; of mussel, 98.

Epigeal, 23.

Epiphyte, 35, 110.

Epithelial, 12, 54.

Equisetums, 201.

Erect posture, 3.

Esophagus, 74, 101.

Essays, subjects for, 15, 25, 50, 116.

Essential organs, 135.

Ethiopian, 12, 18.

Evaporation, viii.

Excretion, 12.

Excurrent, 51.

Exercise, 45, 48, 49, 57, 67.

Expiration, 79.

Explosive seeds, 172.

Eye, 149; of bird, 159; of frog, 30; of grasshopper, 67, 79; of fish, 111.

Fainting, 57.

Family, 8.

Fangs, venomous, 145.

Farmers' bulletins, 95.

Fatigue, of muscles, 45; of nerves, 130, 131, 136.

Fats, test for, xi.

Fatty tissue, 12, 103.

Feather, 155.

Fehling's solution, xi.

Ferment, 100, 103, 104, 158.

Fermentation, 190,  158.

Fern, 176.

Fertilization, 144; cross, 144, 146,  85; self, 145, 147, 188.

Fiber, 2.

Fibrin, 61.

Fibro-vascular bundles, 61, 90.

Field study, 3, 6, 8, 14, 19, 27, 46, 57, 71, 84, 91, 101, 110, 118, 128, 132, 143, 152, 162, 170, 174, 181,  10, 22, 42, 71, 72, 97, 127, 165, 166, 167, 184.

Filament, 135.

Filter, 163.

Fins, 110, 113.

Flagellum, 21, 27.

Flatworm, 49.

Flavors, 142, 147.

Flea, 92, 93.

Flight, of bird, 157, 175; of moth, 84.

Floral envelopes, 133.

Florets, 140.

Flower, 133, 180,  85; apetalous, 136; clusters, 155; complete, 136; diclinous, 137; double, 142; imperfect, 137; incomplete, 136; lateral, 136; naked, 136; perfect, 137; pistillate, 137; regular, 138; staminate, 137; sterile, 137; solitary, 156; terminal, 156.

Fly, horse, 81; house, 92, 93.

Foliage, 16.

Follicle, 165.

Food, 88; defined, 114; of birds, 177.

Food stuffs, 91.

Food tube, of bird, 163; of fish, 116; of insect, 76; of man, 97; of mussel, 102.

Foot, 29.

Foraminifera, 15, 18.

Forestry, 68.

Formaldehyde, 163.

Formalin, 93.

Framework of plant, 15.

Frog, 128.

Frond, 176, 178, 181.

Fruit, 163,  95.

Fucus, 186.