Hew: f STE GW Viscds sense ec Ers: 
{kin of its egg. And all thefe things will ap- 
pear plainly trom what fhail be faid imme- 
diately. 
HG. An 
The egg of that Butterfly, which is repre- 
fented in N°. VI. is exprefied in this firft en- 
larged figure, in the exact manner wherein it 
appeared under the microfcope. — It is obferved 
hence to be, as it were, confiructed of fifteen 
fmall ribs; each of which manifeftly throws 
a fhade on the adjoining membrane, fituated 
between thofe ribs: and hence it is, that, to a 
perfon looking at the egg, it appears, about 
the fhady parts, to be divided by as many other 
f{maller ribs. Thefe ribs, and the membrane 
of the egg between them, are alfo divided 
crofiwife by regular grooves or channels. It 
may be alfo feen how all thefe ribs concur, as 
it were, in a center toward the fmaller extre- 
mity of the egg, and extend themfelves beyond 
its furface. ‘This egg, when arrived at its full 
increafe, is of a yellowith colour; but it is 
white, when it is freth in the ovidu@t. That 
is, I obferve that thofe eggs in the ovidud, 
which are firft to iffue forth, are perfect; but 
thofe that poflefs an higher place are fmaller, 
though they are of the fame figure with the 
former. ‘Thote that are fituated higheft in the 
oviducts, appear {quare; and fuch as lie yet in 
the extremities of the oviducts are fo wonder- 
fully {mall, that at length they become entirely 
invilible. The fame is likewife obferved in 
the eggs of another Butterfly of this kind; but 
fmatier in the body and wings. I faw thofe 
laying their eggs in the month of May, and 
faftening them to cabbage-leaves, in fuch a 
fituation as I have herein delineated the egg of 
this larger Butterfly; that is, fo that the ribs 
run upwards, but the globular bafis poffeffes 
the lower parts: the fame thing holds with 
refpect to thefe eges. As the Butterflies, if- 
fuing from thefe, are found all the year, it is 
probable they lay their eggs at various times. 
This, however, feems to be done chiefly in 
Autumn, when we obferve their Caterpillars 
in much greater numbers than at any other 
feafon. 
N°. ITI. T exhibit the caft and forfaken coat 
_ of what is called the egg, which a little before, 
I have obferved, was the real InfeG@ or Cater- 
pillar of the Butterfly; fince this Caterpillar, 
like the Chry/falis, is found enclofed in its fkin, 
even within the eee. 
No. HL. The Caterpillar of the Butterfly, or 
the Butterfly lying concealed in the form of a 
Caterpillar, is here reprefented as it appears at 
the full term of its growth. In order to de- 
-monitrate clearly and diftin€tlly, that this Cater- 
pillar is the real Butterfly, and the latter again 
is the Caterpillar itfelf; I fhall firtt defcribe the 
external figure of that Caterpillar, which con- 
ceals the Butterfly within its fkin. As the 
celebrated and learned Mr. Ray has, before 
me, very clearly and perfpicuoufly performed 
this tafk, I fhall therefore make ufe of his 
words, defcribing the Caterpillar in this man- 
ner, “If we confider the bignefs of the Ca- 
as 
*« terpillar that feeds on cabbage, it is of a. 
** middle fize, between the largeft and {malleft 
“ kinds; and is covered with whitifh, thin, 
“ {hort hairs, no where cluftered together or 
** entangled. ‘T’he colour of the body is va- 
*« riegated, and compofed of black, yellow; 
** and blue; whereof the yellow defcribes 
“« three lines as long as the body, that is, one 
‘in the middle of the back, and the two 
*< others on the fides oppofite to each other, 
*¢ Between thefe lie the black and blue: the 
** former painted in fpots, the latter more 
*« diffufed. Thefe black {pots alfo are protu- 
** berant above the reft of the body; and out 
“¢ of each of their centers, where they appear 
*¢ blacker than elfewhere, they emit the hairs 
** before mentioned. The head likewife has 
“« the three aforefaid colours mixed together, 
** and it is covered with the like hairs, The 
** legs, being fixteen in number, are orderly 
“* difpofed intc three clafles: the firft of which 
“ clafs is compofed of fix, annexed to the 
*« head, near the breaft: the fecond confifts of 
** eight, on the belly; and the third of only 
“ two, joined to the extremity of the body. 
“© The firft fix legs have each a claw; the 
other ten have each many crooked ones,” 
This is enough, as to the outward form. 
In order to difcover plainly that a Butterfly 
is enclofed and hidden in the {kin of this Cater- 
pillar, the following operation muft be ufed, 
One muft choofe a full-grown Caterpillar : tie 
to its body a {mall thread, and then put it into 
boiling water, and take it out foon after, 
Thus its external {kin will feparate ; becaufe 
the fluids, between the two ‘kins, are by this 
means rarefied and dilated, and therefore they 
break and feparate both the veflels and the 
fibres, wherewith they were united together. 
By this means the external fkin of the Cater- 
pillar, being fpontaneoufly feparated, may be 
eafily drawn off from the Butterfly, which is 
contained and folded up init. This done, it 
is clearly and diftintly feen, that, within this 
fkin of the Caterpillar, a perfect and real But- 
terfly was hidden. Therefore the fkin of the 
Caterpillar muft be confidered only as an outer 
garment, containing in it parts belonging to 
the nature of a Butterfly, which have grown 
under its defence by flow degrees, in like man- 
ner as in all other fenfitive bodies that increafe 
by accretion. 
But as thefe limbs of the Butterfly, which 
lie under the fkin of the Caterpillar, cannot, 
without very great difficulty, be difcovered in 
the full-grown Caterpillar, unlefs by a perfen 
accuftomed to fuch experiments, becaufe they 
are very foft, tender, and fmall, and are more- 
over complicated or folded together, and en- 
clofed in fome membranaccous integuments ; 
it is therefore neceflary to defer the execution 
of the operation, juft now propofed, until the 
feveral parts of the Butterfly become fome- 
what more confpicuous than at firft, and are 
more increafed and fwelled under the fkin, by 
force of the intruded blood and aqueous hu- 
mour. This is known to be the cafe, when 
G the 
