45 1 
TflE BUTTERFLY. 
refpiration is can led on during the whole period of their 
inactive (late. After the appointed dine, when the ani- 
mal has acquired fu Indent vigour, the fhell is broken, 
■which at once conftituted the grave of the caterpillar, 
and the cradle of the butterfly : the down already grown 
upon the infect has completely feparated it on all fides 
from the fhell, which, by the aftion of the head, is bro- 
ken oppoflte to that part, and affords free egrefs to the 
prifoner it fo long confined *. 
The wings of the butieifly, on its firft appearance, are 
clofely folded; but by the help of a liquor conflantly cir- 
culating through them, they are foon expanded, and fuf- 
ficiently hardened, by the action of the air, to endure the 
efforts of flying. It is then that the infedh enters upon a 
more enlarged fphere of action, with increafed powers : 
He ranges from flower to flower, darting his roll ram in- 
to their neftaria for the delicious fiores they contain. 
Ihen too in the full poffeffion of every faculty granted 
to his race, he prepares to multiply and perpetuate it. 
This lair and molt confiderable metamorphofis, is at- 
tended with a greater change in the economy of the ani- 
mal, than any of the preceding ; not only thefkin, but the 
teeth, jaws, and cranium , are left behind. The largeartcry 
which pafics along the body, may be coufidered as a fuc- 
ceffion of different hearts employed in circulating the 
Mood, which is at that important sera, obferved to flow 
ln a different dire£lion from what it did before, like the 
foetus of a quadruped after birth f: Formerly it circulat- 
e d from the extremity to the head ; it now purfues a 
uourfe direftly oppoflte. 
3 Lj The 
* Idem, mem. 14, 
t Vide Malphigi and Reaumur. Toir.e I. mem. 10. 
