Phe ¢ 4-1) SUL. OARVY lek 1 WS EB Gu s,. 25 
ing the laft fkin, there is as much art obferved as 
in the drawing off of the external skin of the Ca- 
terpillar; I fhall here briefly explain the whole 
order of this laft change, or the fudden {welling 
out of the limbs. 
In the vir Figure I exhibit the Butterfly, the 
limbs of which were. before reprefented in the 
iv Figure, and as having put onthe form of a 
Chryfalis, celineated under No. V. And this Chry- 
falis being very near iss metamorphofis, isin that 
ftate évery moment ready to caft its laft skin. If 
any one defires to know, by what means it can 
be known, that this change is very near; let 
him obferve, that this may be certainly known 
beforehand by thofe black fpots, which are ob- 
ferved to appear through the skin of the Chry- 
falis, at the ends of the two upper wings; and 
therefore I delineate one of thofe pellucid fpots 
in the left wing of this Butterfly-Chryfalis. 
In order to underftand the method, whereby 
this laft change of the skin is performed, it is 
neceflary to know, that after the enclofed limbs of 
the Butterfly, have by degrees.acquired their full 
ftrength, by the help of an infenfible perfpira- 
tion, it at length, by agitating and moving itfelf, 
and by drawing its breath with greater force, 
breaks open the external skin with which it is 
furrounded, in three or four different places, 
and difplays loofe and free its hitherto united. 
arts. 
When the invefting skin juft begins to open, 
it is obferved, that the ftrength of the enclofed 
Butterfly is likewife increafed. And hence it then 
immediately thrafts its horny trunk and legs out 
the skin, and fixing the claws of its feet to the 
adjacent objects, or to its own caft skin, it thus, 
as it were, by force, difengages itfelf {rom this 
laft covering. Thus atlength it creeps out of its 
skin, formed in the manner exhibiied in the 
ninth Figure. Nor doesits appearance then dif- 
fer much from that which it had, when drawn 
out of the skin of the Caterpillar by art, as may 
be feen by the Figure. 
I defire leave to obferve here, that the crea- 
ture fcarce retains this form a moment; for as 
_ foon as the skin is regularly broke open, and the 
Butterfly juft begins to creep out of it, immedi- 
ately its wings begin to increafe, and they grow 
wonderfully faft. Before I treat this matter more 
fully, I muft obferve what I have hinted at in 
the preceding fheets; that is, that the limbs, 
and efpecially the wings of the Butterfly, are of 
three diftingt fizes: they are fmalleft when they 
lie in the Caterpillar, delineated under No. III. 
and then in the Butterfly, drawn out of the skin 
of the Caterpillar, as in Fig. IV. they were 
obferved fomewhat larger; and laftly, they have 
acquired their third and full magnitude, when, 
by the impelled blood and humours, they have 
been orderly fituated in the Chryfalis, delineated: 
No. V. But even then, they could not extend 
themfelves further; becaufe the laft skin that 
remained to be caft off, did not permit it. 
Therefore, when thefe laft skins are caft off, 
it is at length feen, how thefe wings increafe, 
{well, and are expanded in a moft- wonderful 
manner, by the force of the blood, humours, 
and impelled air: this is exhibited in the x Fi- 
gure. When any one has for fome time confi- 
dered this matter in the Butterfly itfelf, he will 
fay that it is lrke a drop of water, which, when 
it falls on dry paper, dilates the paper; and makes 
it unequal, thick, and full of holes. In the fame 
manner, indeed, thefe wings, whichare in the 
beginning rough and full of wrinkles, and un- 
equal, fold and expand themfelves, until at 
length they become {mooth, and they are then 
twelve time times as large as they were in the 
beginning. ‘This may be feen in No. VI. where 
I reprefent the wings fully and perfectly expand- 
ed, and in their natural fize. 
What deferves moft adiniration is, that all this 
accretion of the wings, great as it is, does not 
take up the {pace of a quarter of an hour, And 
befides, what is very confiderable is, that if at 
this time a part of the growing wings be cut off 
with {ciffors, they manifeftly difcharge blood 
more or lefs copious, according as the wing is 
wounded at~a le{s or. greater diftance from the 
body. This blood, which is yellowith, diftils 
in mall globules out of the wounded veffels, and 
the wing never afterwards expands itfelf properly: 
But thefe wings, being once wholly extended 
and dried, will never afterwards difcharge any 
blood, though they be wounded ever fo often. 
Hence it is evident, that this creature, in the 
{pace of a quarter of an hour, is fent forth from 
the Chryfalis in every refpect perfe@t *, fo that 
it never afterwards wants a further accretion, not 
is {ubject to the mifchances of infancy. 
In what manner thefe wings are in reality éx- 
panded, and how their black {pots are diffufed 
from fmall into large ones, and how all the co- 
lours of thefe wings are increafed, and are all to~ 
gether equally changed by the fame motion; 
thefe, with other innumerable curious and won- 
derful myfteries of nature, I fhall, if it pleafe 
God, explain hereafter in a treatife’ exprefly on 
that fubject: and I fhall then thew how one may 
view, as clear as the light at noon, the refurrec- 
tion of the dead, and the happy ftate of thofe 
that are brought to life again, in this little in- 
fed. 
I fhall finally in this place briefly lay before 
the eye, the limbs of the Butterfly, and the in- 
creafing wings in a rough draught, and after. 
wards conclude this hiftory. Firft, in the head 
are feen two reticulated eyes. Over thefe are ob- 
ferved two horns, Fig. x1. a a, divided into their 
joints, and adorned with white, yellow and 
* ‘The whole operation in the difclofure of the Butterfly from its Chryfalis, is full of wonder; but in no part fo much as in the expan- 
fion of the wings. From the folded and complicated ftate wherein they lay in the Chryfalis, they difplay themfelves fo fuddenly, that 
the firft obfervers thought they were fmall at that time, and grew thus fuddenly. The fubftance of thefe wings is membra- 
naceous, and the duft which covers them is compofed of regular little parts, called by fome feathers, and by others {eales ; but neither 
properly. They have footftalks, and they are of various figures, oval, round, oblong, andindented. On thefe depend the colours 
of the wings. The veflels which fupport the filmy fubftance of the wing, contract as {oon as the wing is expanded ; for, till then, they 
aretubular. They are like the navel-ftring in the human body ; 
at firft vafcular, but afterwards folid. ‘The edges of the wi 
fepported by a trong tib, and fringed with thefe feathery fubftances. en sy oe 
Hi 
eeaeie 
