The book The System of Animate Nature 1 was written by author J Arthur John Arthur Thomson Here you can read free online of The System of Animate Nature 1 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The System of Animate Nature 1 a good or bad book?
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A. Earland have described (1915) what looks like constructive skill in the use of materials. As every one knows, many unicellular animals secrete shells of exquisite beauty, the ^ organic crys- tallisation ' of which is as much of an unsolved problem as the adaptive internal architecture of bones, but in the case of the arenaceous Foraminifera the building materials are found ready-made in the environment and are utilised very effectively to form a casing. The points of special interest are two..., — (1) that a particular kind of material, such as sponge-spicules, is selected from the surrounding debris, from Digitized by Google 186 ANIMAL BEHAVIOUR amid a multitude of apparent alternatives, and (2) that it is utilised in a fashion which is interpretable as peculiarly adaptive. The first point may be illustrated by the case of Technitella thompsoni, which covers itself with minute per- forated Echinoderm platelets; the second point by the case of Marsipella spiralis^ which arranges its encasement of sponge-spicules in a spiral, doubtless of considerable archi- tectural value.
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