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The history of silk, cotton, linen, wool, and other fibrous ... - Cd3wd.com

The history of silk, cotton, linen, wool, and other fibrous ... - Cd3wd.com

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150 CULTIVATION AND MANUFACTURE OF SILK.<br />

most perpendicular, they emitted from their spinnijig appa<br />

ratus a sinall quantity <strong>of</strong> the glutinous secretion tcith which<br />

they construct their webs. This viscous substance being<br />

dra\m out by the ascending current <strong>of</strong> rarefied air into fine<br />

lines several feet in length, was carried upward, until tlie spi-<br />

ders, feeling themselves acted upon with suthcient force in that<br />

direction, quitted their hold <strong>of</strong> the objects on which they stood,<br />

<strong>and</strong> <strong>com</strong>menced their journey by mounting al<strong>of</strong>t.<br />

'• Whenever the hues became inadequate to the purpose for<br />

which they were intended, by adhering to any fixed body, they<br />

were immediately detached from the spinners <strong>and</strong> so converted<br />

into terrestrial gossamer, by means <strong>of</strong> the last pair c^ legs, <strong>and</strong><br />

the proceedings just described were repeated ; which plainly<br />

proves that these operations result from a strong desire felt by<br />

the insects to eflfect an ascent*.'' Mr. BlackwaU has recently<br />

read a paper (still unpublished) in the Linnaean Society, confij:-<br />

matory <strong>of</strong> his opinions.<br />

6. " Without going into the particulars," says Mr. Rennie,<br />

" <strong>of</strong> what agrees or disagrees in the above expeiiments with<br />

our own observations, we shall give a brief account <strong>of</strong> what<br />

we have actually seen in our researches. So far as we have<br />

determined, then, all the various species <strong>of</strong> spiders, how differ-<br />

ent soever the form <strong>of</strong> their webs may be, proceed in the circum-<br />

stance <strong>of</strong> shooting their hnes precisely aUke ; but those which<br />

we have found the most manageable in experimenting, are the<br />

small gossamer spider (Aranea ohtextrix, Bechstein), known<br />

by its shuiing blackish-broA\Ti body <strong>and</strong> reddish-brown semi-<br />

transparent legs ; but particularly the long-bodied spider ( Te-<br />

trognatha extensa, Latr.), which varies in color from green<br />

to brownish or grey—but has always a black line along the<br />

belly, with a silvery white or yeUownsh one on each side. <strong>The</strong><br />

latter is cliiefly re<strong>com</strong>mended by being a very indvistrious <strong>and</strong><br />

persevering spinner, while its movements are easily seen, from<br />

the long cyhndrical form <strong>of</strong> its body <strong>and</strong> the length <strong>of</strong> its legs.<br />

'• "We placed the above two species with five or six <strong>other</strong>s, in-<br />

cluding the garden, the domestic, <strong>and</strong> the labyrinlhic spiders,<br />

* Linn. Trans., vol. xv. p. 453.

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