. Principes du zoo économique ?logie. Zoologie, économique. Direction générale 308 cordés au sud et sont d'une grande valeur spécifique il y en raison de leurs raids sur l'anthonome du cotonnier, de sorte qu'ils devraient être encouragés et protégés de l'English Sparrow. Les loriots n service royal dans la capture, les charançons sur les capsules. Les merles noirs, les troglodytes et voler des objets agréables à faire du bon travail. Les moineaux puceron du blé vert de l'CaroHna. Au cours d'une épidémie de ver- chancre dans un verger central Illinois les enquêtes du Professeur S. A. Forbes a montré que la nourriture de merles, grives, le moqueur roux, et oiseaux bleus

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. Principles of economic zoo?logy. Zoology, Economic. 308 BRANCH CHORDATA to the South and are of great specific value there by reason of their raids upon the cotton-boll weevil, so they should be encouraged and protected from the English sparrow. Orioles do royal service in catching weevils on the bolls. Blackbirds, wrens, and fly-catchers do good work. Sparrows prey upon the green wheat aphid of North CaroHna. During an outbreak of canker- worm in a central Illinois apple orchard the investigations of Prof. S. A. Forbes showed that the food of robins, catbirds, brown thrashers, and bluebirds consisted of 96 per cent, insects, of which 16 per cent, was cankerworms, while the food of the house wrens he examined was 50 per cent, cankerworms; 25 per cent, of the food of the hairy and downy woodpeckers consists of bor- ing larvae. It is true that birds eat a certain percentage of fruit and seeds, but the entire amount of vegetable matter is usually much less than the animal matter consumed. A large proportion of the seeds eaten are weed seeds (Fig. 253), such as dandelion, dock, knot-weed, purs- lane, pigeon-grass, and rag-weed.^ The grain which birds eat is, much of it, picked up from the waste matter about the farm-yard. Doctor Judd^ says the great horned owl, the sharp-shinned and Cooper hawk, and the English sparrow are injurious birds. Fig. 253.—Weed seeds commonly eaten by birds: a, Birdweed; h, lambs' quar- ter; c, purslane; d, amaranth; e, spotted spurge; /, ragweed; g, pigeon grass; A, dandelion. (Biological Survey, U. S. Dept. Agricul.) ' Jackson and Daugherty, School Garden." '^ Linville and Kelly. ' Agriculture through the Laboratory and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B.

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