| Obferv. XX XIX. Of the Eyes and Head of a Grey diorie-Fly, 
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‘and of feveral other creatures. e 
took a Jarge grey Drowe-Fly, that had adatge-head, buta {niall and 
§ flender body in proportion ie it,and cutting off-its head, Lfix‘d. it,with 
the forepart or face upwards upon my Object Plate (this, made choice 
ofrather then the head ofa great bhie Fly,beeaufé my enquiry being now 
about the eyes,[ found this Fly to have, firftthe biggeft clufters,of eyes 
in proportion to his head, ofany {mall kind of Fly that I have yet feen, it 
being fomewhat inclining towards the make oi the large’ Dragon-F lies, 
Next, becaufe there is a greater yariety in thé, knobs or ‘balls of each 
elufter,then is of any {mall Fly) Then examining it according to my ufual 
manner, by varying the degrees of light, and altering its polition toeach 
kinde of light, I drew that reprefentation of; it which is delineated in 
the 24. Scheme, and found thefe things to be as plain and evident, as 
notable and pleafant. | 
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the light. ‘ Py cE itt FO 
. ‘Next, that of thofe multitudes of Hemifpheres, there were obfervable 
fot found in any other {mall Fly. : UTS 
Thirdly, that every one of thefe Hemifpheres,as they feem’d.to be pret- 
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| a neer the true fhape of a Hemifphere, fo was the furface exceeding 
h and regular, reflecting as exact, regular, and perfect anImage of 
any Obje& from the furface of them, as a {mall Ball of Quick-filver of 
that bignef would do, but nothing neer fo vivid, the reflection from thefe 
very languid, much like the reflection from the outfide of Water, 
— Glafs, Cryftal, @c. In fo much that in each of thefe Hemifpheres,1 have 
| been able to difeover a Land-feape of thofe things. which lay before my 
window, 
