File:Image from page 103 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598320459).jpg

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Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library


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Text Appearing Before Image: pider lets go, andis supported by the currents in the air while it is waftedgreat distances. Thus Darwin, on his voyage in theBeagle, saw cobwebs bearing up spiders floating in the air over his vessel more thansixty miles from shore. The method of spinningdeserves careful attention.The spinning-organs consistof a set of glands lying in thehinder part of the abdomen,and opening to the exteriorthrough a number —- oftenseveral hundred--of spin-ning spools. These spoolsare the modified mouths ofglands, and are groupedupon and between tuberclescalled spinnerets. Thesecretions of the glands, asthey are poured out intothe air, fuse together and harden into a thread. The thickness of the thread isdetermined by the number of glands secreting together. More subtle web Arachne cannot spin ;Nor the fine nets, which oft we woven see,Of scorched dew, do not in th ayre more lightly flee. Thompson writes: — How still the breeze ! save what the filmy threadsOf dew evaporate brushes from the plain.

Text Appearing After Image: THE SPIDKU AND ITS ALLIED 85 Classification. - -Spiders are separated, according as theyspin webs or do not do so, into two main groups, sedentaryand wandering spiders. The sedentary spiders are sub-divided into four sub-orders, which we shall consider inturn: —


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Source Image from page 103 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900)
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