In subsequent experiments we found that it was not indispensable for
the spider to rest upon a solid body when producing a line, as she can
do so while she is suspended in the air by another line. When the
current of air also is strong, she will sometimes commit herself to it
by swinging from the end of the line. We have even remarked this when
there was scarcely a breath of air.
We tried another experiment. We pressed pretty firmly upon the base of
the spinnerets, so as not to injure the spider, blowing obliquely over
them; but no floating line appeared. We then touched them with a pencil
and drew out several lines an inch or two in length, upon which we blew
in order to extend them; but in this also we were unsuccessful, as they
did not lengthen more than a quarter of an inch. We next traced out
the reservoirs of a garden-spider (_Epeira diadema_), and immediately
taking a drop of the matter from one of them on the point of a fine
needle, we directed upon it a strong current of air, and succeeded in
blowing out a thick yellow line, as we might have done with gum-water,
of about an inch and a half long.
When we observed our long-bodied spider eager to throw a line by
raising up its body, we brought within three inches of its spinnerets
an excited stick of sealing-wax, of which it took no notice, nor did
any thread extend to it, not even when brought almost to touch the
spinnerets. We had the same want of success with an excited glass rod;
and indeed we had not anticipated any other result, as we have never
observed that these either attract or repel the floating threads,
as Mr. Murray has seen them do; nor have we ever seen the end of a
floating thread separated into its component threadlets and diverging
like a brush, as he and Mr. Bowman describe. It may be proper to
mention that Mr. Murray, in conformity with his theory, explains the
shooting of lines in a current of air by the electric state produced by
motion in consequence of the mutual friction of the gaseous particles.
But this view of the matter does not seem to affect our statements.
Nests, Webs, and Nets of Spiders.
Public-domain text, read in full here on John Shaqi.
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