. Manuale di natura-studio per insegnanti e genitori, basato sulla natura di Cornell-studio di volantini. Lo studio della natura. Studio di insetto 361. Oak apple, mostrando la larva di fiele insetto. Comstock il manuale. Possiamo prendere la storia della quercia comune apple, come un esempio. Un po', quattro-alato, fly-come creatura depone le uova, a inizio stagione, sul battente della quercia scarlatta. Non appena la larva portelli, comincia a mangiare nella sostanza di una delle vene di foglia. Come si mangia, si scarica attraverso la sua bocca nei tessuti della foglia, una sostanza che è secreto dalle ghiandole entro il suo corpo. Immed

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. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. Insect Study 361. Oak apple, showing the larva of the gall insect. Comstock's Manual. We may take the history of the common oak apple, as an example. A little, four-winged, fly-like creature lays its eggs, early in the season, on the leaf of the scarlet oak. As soon as the larva hatches, it begins to eat into the substance of one of the leaf veins. As it eats, it discharges through its mouth into the tissues of the leaf, a substance which is secreted from glands within its body. Immediately the building of the house commences; out around the little crea- ture grow radiating vegeta- ble fibers, showing by their position plainly that the grub is the center of all of this new growth; mean- while, a smooth, thin cover- ing completely encloses the globular house; larger and larger grows the house until we are accustomed to call it an oak apple, so large is it. The little chap inside is surely content and happy, for it is protected from the sight of all of its enemies, and it finds the walls of its house the best of food. It is comparable to a boy living in the middle of a giant sponge cake, and who when hungry would naturally eat out a larger cave in the heart of the cake. After the inmate of the oak apple completes its growth, it changes to a pupa and finally conies out into the world a tiny four-winged fly, scarcely a quarter of an inch in length. The story of the willow cone-gall is quite different. A little gnat lays her eggs on the tip of the bud of a twig; as soon as the grub hatches and begins to eat, the growth of the twig is arrested, the leaves are stunted until they are mere scales and are obliged to overlap in rows around the little inma^:, thus making for it a cone-shaped house which is very thoroughly shingled. The inhabitant of this gall is a hospitable little fellow, and his house shelters and feeds many other insect guests. He does not pay any a

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• bookcentury1900
• bookdecade1910