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they advance towards the circumference, where they 
turn like a wheel, with a great deal of vivacity and' 
fwiftnefs, till they caufe a kind of a vortex, into 
which you will fee all fmaller infects or bodies either 
attraded or driven, which probably ferve as nourifh- 
ment for thofe little crown’d things, who in all ap- 
pearance are, as well as the plant, a fort of infedts of 
prey, that live on fmaller creatures. When one of 
thofe little heads has wheel’d a while, it refts, and 
another turns out ; and fometimes you will fee three 
or four wheeling at a time. We have feen lafl year 
fome much more regular, that formed an orderly cir- 
cle, with their crowns to the circumference, and 
their thin bodies like fo many radius’s join’d to the 
centre. Their motion is all flrait towards the edge 
of the circle, and never to the right and left, as if 
every head had its proper limits to ad upon. One 
Symoy, an optique inftrument- maker, found the 
fir ft of thofe infeds as he was fear chi ng for polypes j 
which gave me fince an occafion of examining ditch- 
water, where I not only found the plant, but the 
crown d .infed, and a good many other furprifing 
little things, of all fhapes and fafhions, of which I 
will take the liberty to fend you an account. 
IVIr. Mitchell, the Britifh minifter for the congrefs 
at BrufTels, faw thofe curious infeds, and obferved, 
which we did not take notice of before, that the 
fruit of the plant, which refembles an orange, has a 
kind of a chain about it, that turns as the crown 
does in the other infed. He took notice alfo, that the 
trunk or ftock of the plant was its gut, or ftomach ; 
for he faw, that fbmething defeended through it, as it 
were 
