Only pfoper to a great number of Infects, but Man, the 
moft excellent-of all Creatures, fwims for nine months 
in his Mothers Wouib. 
When the young LibelU are ready to quit their 
cafe, and appear to the woi ldin their fineft ornaments, 
it is admirable to fee the way they ufe to dean them- 
felves 5 it dilates as Belly, that the water may enter 
in at the Af^uf upon the Intefdn, then it comprefles it 
felf to circulate tht water, which it expels, and (hoots 
out a great way : It receives more water into its In- 
teftins, and ejefts after the fame manner. Ic continues 
this aftion with great force for fome time, and makes 
the water circalaic in the Veffel, all which motions 
may be compared to the breathing or panting of atiorfe 
who has been run hard. 
As Reafon without Experience fometimes give us 
notions of things feeming natural, fo I thought they 
took the Water in at their Mouths to fyringe it thro 
the Jms 5 but to fatisfy my felf of matter of tad, I 
put a LibelU upon my Finger, which I held faft 
by theXegs. I dipt it under Water with its Head 
downwards, the Anus being even with the Water, fo 
that it might get into the Inteftin^s, which it caft out 
a good way ^ I drew my Finger a little farther out, fo 
that the Water could not enter at the Anus 5 the Fly 
continued its motion, but ejefted no Water, My opi- 
nion is, fhe does this in order to cleanfe herlelf from 
all Excrements ia that Element, where fne leaves her 
old Robes, to appear in a more glorious and new form 
in the open Air. 
There are a great number of fmall veffels which 
clofely unite the body of the Lihella^ to its cafe 5 it is 
iieccflary that thefe be dry, that they may the fooner 
break, when it makes its efforts to get out of its cafe, 
which cannot come to pafs as long as there is any ali- 
ment in the Inteft^n to afford Kourilbirent to the cafe 
and 
