File:American insects (1905) (14741943946).jpg

Identifier: americaninsects00kellog (find matches)
Title: American insects
Year: 1905 (1900s)
Authors: Kellogg, Vernon L. (Vernon Lyman), 1867-1937
Subjects: Insects
Publisher: New York, H. Holt and Company
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Smithsonian

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developing, the ventral nerve-chain first, then the alimentary canal,and later the muscles, tracheae, and the heart. All the time the yolk isbeing gradually used up, fed on, by the cells of the developing and growingembryo, until finally comes the disappearance of all the stored food, and thetime for hatching. Development and Metamorphosis 39 The eggs have been laid, because of the remarkable instinct of themother, in a situation determined chiefly by the interests of the youngwhich are to hatch from them. The young of many kinds of insects takevery different food from that of the mother—a caterpillar feeds on greenleaves, the butterfly on flower-nectar—or live under very different circum-stances—young dragon-flies and May-flies live under water, the adults inthe air. A monarch butterfly, which does not feed on leaves, nor has everbefore produced young, seeks out a milkweed to lay its eggs upon. Theyoung monarchs, tiny black-and-white-banded caterpillars, feed on the rr~^r—^C
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Fig. 6q.—Early stages in the development of the egg of saw-fly, Hylotoma beriberidis.C, ventral plate removed from egg; D, ventral plate, showing segmentation of body;E, embryo, showing developing appendages; F, same stage, lateral aspect; G, olderstage, lateral aspect, ant., antenna; md., mandible; mx., maxilla; //., labium; ll, P, P,legs; sg., salivary glands; si., spiracles; ab.ap., abdominal appendages; n.c, nerve-centers; a., anal opening; lb., labrum; sd., oesophageal invagination; y., yolk;b.s., abdominal segments; pd., intestinal invagination; am., amnion; s., serosa.(After Graber; greatly magnified.) green milkweed leaf-tissue; indeed they starve to death if they cannot haveleaves of precisely this kind of plant! The reason that the butterfly, whoseonly food is the nectar of almost any kind of flower, ranges wide to find amilkweed for its eggs, is one not founded on experience or teaching or iea-son, but on an inherited instinct, which is as truly and as importantly anattri

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