Civic Biology: Textbook of Problems, Local and National, that Can be Solved Only by Civic Coöperation |
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acre adult Agriculture American amphibia animals Anopheles ants apple aquaria aquarium attack bacteria beetle biology birds breeding brown-tail bushels cabbage catch caterpillar cause cent civic civic biology clams common coöperation corn crop culture diphtheria discovered discovery disease eggs estimated experiment extermination farm feed female fever field fish flies forest frogs fruit fungi fungus garden gelatin germs grow growth hatch hookworm house fly important inches insects kill laboratory larva larvæ living lobster malaria methods milk molds mosquitoes moth mushrooms mussels natural enemies nest organs oyster pair parasites pests Photograph pileus plants poison pond possible potatoes pounds present problems produce rats season seeds snakes soil sparrow species specimens spores stable fly tapeworm tick tion toads trap trees typhoid United States Bureau valuable vegetable weeds wild wings wood worm yeast yellow fever young