180 NATURAL HISTORY OF SELBORNE. 
he imagined might have been blown, hke Thistle-down, from the 
common above : but, to his great astonishment, when he rode to 
the most elevated part of the down, 300 feet above his fields, hi 
found the webs in appearance still as much above him as before; 
still descending into sight in a constant succession, and twinklmg 
in the sun, so as to draw the attention of the most incurious. 
Neither before nor after was any such fall observed ; but on 
this day the flakes hung in the trees and hedges so thick, that a 
diligent person sent out might have gathered baskets full. 
The remark that I shall make on these cobweb-hke appear- 
ances, called gossamer, is, that, strange and superstitious as the 
notions about them were formerly, nobody in these days doubts 
but that they are the real production of small spiders, which 
swarm in the fields in fine weather in autumn, and have a povrer 
of shooting out webs from their tails so as to render themselves 
buoyant, and lighter than air. But why these apterous insects 
should that day take such a wonderful aerial excursion, and why 
their webs should at once become so gross and material as to be 
considerably more weighty than air, and to descend with preci- 
pitation, is a matter beyond my skill. If I might be allowed to 
hazard a supposition, I should imagine that those filmy threads, 
when first shot, might be entangled in the rising dew, and so 
drawn up, spiders and all, by a brisk evaporation into the regions 
where clouds are formed : and if the spiders have a power of 
coiling and thickening their webs m the air, as Dr. Lister says 
they have, [see his Letters to Mr. Ray] then, when they were 
become heavier than the air, they must fall. 
Every day in fine weather, in autumn chiefly, do I see those 
spiders shooting out their webs and mounting aloft : they will 
go ofl* from your finger if you will take them into your hand.* 
Last summer one alighted on my book as I was reading in the 
parlour ; and, running to the top of the page, and shooting out 
a web, took its departure from thence. But what I most won- 
dered at was, that it went off with considerable velocity in a place 
where no air was stirring ; and I am sure that T did not assist it 
with my breath.f So that these little crawlers seem to have, 
v/hile mounting, some loco-motive power without the use of 
wings, and to move in the air faster than the air itself. 
* The commonest spscies of spider that spins gossamer, is the aranea ohtectrix of systematists. 
—Ed. 
■ t Mr. White must have been deceived in this instance, for it will be found that the gossamer 
spider endeavours in vain to float Us yveb when placed under a glass receiver. — E». 
