11S Of Spiders. 
them with five little teats, or nipples, near the extremity 
of the tail; whence a gloomy liquor proceeds, which ad¬ 
heres to any thing it is preffed againft °, and being drawn 
out, hardens inftantly in the air, and becomes a firing or 
thread ftrong enough to bear five or fix times the weight 
of the fpider’s body; this thread is compofed of feveral 
finer ones, that are drawn out feparately, but ? unite to¬ 
gether at two or three hair’s breadth diflant from the 
body of the fpider. The threads are finer or coarfer, ac¬ 
cording to the fize of the fpider that fpins them. 
Fig. 178. reprefents a part of the threads, which 
came out of two of their working inflruments, and were 
divided from each other, juft as they iffue from the 
body; and R S T V, fig. 179. reprefents one of the four 
outermoft inftruments or nipples, with its quills or reeds, 
which put together is not fo large as a common grain 
of fand; from whence it is eafy to conceive, how final! 
thofe inftruments muft be, and how fine the threads en- 
cafed within them. At W thefe working inftruments 
ftood as thick by each other, as they are reprefented be¬ 
tween R and S ; and that part of the figure* from the 
fight, was not cover’d with thofe fort of quills, but 
with hairs only. It is alio obfervable, that a few of thefe 
inftruments are bigger than the reft, and confequently 
produce a larger thread. C F, fig. 180. reprefents one 
of thefe between two others of the finaller fort D E and 
A B, one of which had a wrinkled or harled thread. 
Spiders emit their eggs, not out of the hinder part of 
their body, as in all other animals, but under that upper 
part of the belly, near the hind legs, where grows a kind 
of hook, of a particular figure, which partly covers the 
aperture from whence the eggs iffue. Fig. 181. repre¬ 
fents a fpider of an ordinary fize, with its legs contra&ed, 
as 
^ Phil. Tranf. No, 272, f I??id No. 325. 
