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Hooke, Robert, 1635-1703 / Micrographia: or some physiological descriptions of minute bodies made by magnifying glasses : with observations and inquiries thereupon
(MDCLXVII [1667])

Observ. XLII. Of a blue fly,   pp. 182-185


Page 182


               M I CROGR AP HI A.
not appear fo rounded, and lying above the Paper, as it were,as it ought
to do) that is, it was for the moft part pretty oval end-ways, fomewhat
like an Egg,but the other way it was a little flatted on two oppofite fides.
Divers of thefe Eggs, as is common to moft others, I found to be bar-
ren, or addle, for they never afforded any young ones. And thofe I
ufually found much whiter then the other that were prolifick. The
Eggs of other kinds of Oviparous Infeis I have found to be perfetly
round every way,like fo many Globules,of this fort I have obferv'd fome
frts of Spiders Eggs ; and chancing the laff Summer to inclofe a very
large and curiously painted Butterfly in a Box, intending to examine its
gaudery with my Microfeope, I found within a day or two after I inclos'd
her, almeft all the inner furface of the Box cover'd over with an infinite
of exadly round Eggs, which were ftuck very faft to the fides of it, and
in fo exadly regular and clofe an order, that made me call to mind my
,jpothejfs, which I had formerly thought on for the making out of all the
regular Figures of Salt which I have elfewhere hintcd; for here I found
all of them rang'd into a moff exadt triagonal order, much after the man-
ner as the Herwifpheres are place on the eye of a Fly 5 all which Eggs I
found after a little time to be hatch d, and out of them to come a multi-
tude of fmall Worms, very much resembling young Silk-worms, leaving
all their thin hollow fhells behind them, fticking on the Box in their trt-
agOnal poflure; thefe I fovwd with the Microfcope to have much fuch a
fubftance as the Silk-worms Eggs, but could not perceive them pitted.
And indeed, there is as great a variety in the fhape of the Eggs of Ovi-
parous Infe~ts as among thofe of Birds.
  Of thefe Eggs, a large and lufty Fly will at one time lay neer four or
five hundred, fo that the increafe of there kind of Infefts muff needs be
very prodigious, were they not prey'd on by multitudes of Birds, and de-
firoy'd by Frofts and Rains; and hence 'tis thofe hotter Climates between
the Xl ropicks are infefted with fuch multitudes of Lotufts, and fuch other
Vermine.
               Obferv. XLII. Of a blue Fly.
-frHis kind of Fly,whereofa AIicrofcopical Pidrure is delineated in the
TLfirft Figure of the 26. schere, is a very beautifull creature, and has
many things about it very notable ; divers of which I have already partly
defcrib'd, namely, the feet, wings, eyes, and head, in the preceding
Obfervations.
  And though the head before defcrib'd be that of a grey Drone-Fly,
yet for the main it is very agreeable to this. The things wherein they
differ moft, will be eafily enough found by the following particulars:
  Firft, the clufters of eyes of this Fly, are very much fmaller then thofe
of the Dron-Foy, in proportion to the head.
                                                              And


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