. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds . lkworms in Medford, Mass. He made a special study ofthe American silkworm (Telea Polyphemus). Regarding itsfood and growth he says : — It is astonishing how rapidly the larva grows, and one who has hadno experience in the matter could hardly believe what an amount offood is devoured by these little creatures. One experiment wliich Imade can give some idea of it. When the you
. Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds . lkworms in Medford, Mass. He made a special study ofthe American silkworm (Telea Polyphemus). Regarding itsfood and growth he says : — It is astonishing how rapidly the larva grows, and one who has hadno experience in the matter could hardly believe what an amount offood is devoured by these little creatures. One experiment wliich Imade can give some idea of it. When the young worm hatches out, it A probable cause for this voracity in the case of herbivorous larvae is that thestomachs do not have the power of dissolving the vegetable matter received intothem, but merely of extracting from it a juice. This is proved both by theirexcrement, which consists of coiled-up and hardened particles of leaf, which,when put into water, expand like tea, and by the great proportion which theexcrement bears to the quantity of food consumed (Kirby and Spences Ento-mology, p. 259). ^ Our Insect Enemies, by J. A. Lintner. Sixteenth Annual Report, NewJersey State Board of Agriculture, 1888-89, p.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, bookyear1913
