Immagine di archivio da pagina 256 della American ragni e loro la filatura. Ragni americani e il loro lavoro di filatura. Una storia naturale dell'orbweaving ragni degli Stati Uniti, con particolare riguardo alla loro industria e abitudini CUbiodiversity1121211-9810 Anno: 1889 ( COCOON VITA E HABYHOOD. 251 volte la propria lunghezza e Icnow liow per effettuare una perfetta miniatura dei nidi del suo io)arents, sembra essere un fatto wliicli lias sc;arcely un io)arallel in natura. (Vedere Fig. 265.) Quando ricordiamo come diHicult una cosa è anche un disegnatore addestrati per ridurre a occhio un disegno complicato o di un modello a un

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Archive image from page 256 of American spiders and their spinning. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits CUbiodiversity1121211-9810 Year: 1889 ( COCOON LIFE AND HABYHOOD. 251 times its own length, and Icnow liow to make a perfect miniature of the nests of its i)arents, seems to be a fact wliicli lias sc;arcely a i)arallel in Nature. (See Fig. 265.) When we remember how diHicult a thing it is for even a trained draughtsman to reduce by eye a complicated drawing or model to a greatly diminished scale, we must own that the performance of this feat by a baby spider is so surprising as almost to exceed belief. And yet even the most complicated form of trapdoor nest, namely, that of the branched double door type, is perfectly reproduced in miniature by these tiny architects, with the upper door, the lower door, the main tube, and the branched body accurately placed. Mr. A. R. Wallace shows that there is some reason to doubt whether birds, which are so frequently said to build by instinct, would construct the nest proper to their kind if they were sep- arated from the mother at the earliest age and reared apart from her or oth- ers of her kind. He states that birds brought up from the egg in cages do not build the proper specific nest; nor do they even sing their parent's song without being taught. Whatever may be the case with birds or other highly organized animals, there is not the slightest reason to doubt that, with spiders, all forms of nests are built in the most perfect condition by the young as soon as they are able to do any work at all after being hatched from the eggs. There is no fact which I have more frequently observed and demonstrated than that all the inter- esting habits of spiders, including those which would appear to require the greatest reasoning powers, or the exercise of faculties that in highly or- ganized animals would imply t

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