( 79^ ) 
Ifeft, and I put it in a thinner Glafs for to look upon it 
more nicely ,with a Microfcope. And when I look'd upoo 
ijr, I obferved a continual Motion in a Veflei, whofe 
Thicknefs was to ray Judgment about the Fourth part 
of a Hair of ones Head. 
This Motion was not by a running through, but eve- 
ry time returned with a quick Motion, and this fo 
fbon after one another , that the Juice which was forced 
through that Veflel, received at leaft Three Pulfations in 
the fame Space, when the Heart in a Humane Body 
fends forth the Blood once. 
By this Propulfion I concluded with my felf, that it 
was an Arterie of this Animal, and that this Vcficl was 
not far from the Heart. 
For I did Fancy, if the (aid Vefiel was far from the 
Heart, the Repetition of a quick Motion could not be 
difcern'd by me fo diftindly and well. 
The other Morning the Snail was dead, only, as I did 
think, for want of Food ; for the other Snails of the 
fame Age, which I left in the Glafs with the Earth, were 
alive. 
The Second Day there was more Snails come out ct 
the Eggs, and tiie Third Day more again. 
I did look feveral times upon a Snail, in manner 2s it 
fate inwards, againft the Glafs, and to my great Satisfa- 
ction, I could fee through the Shell and part of the Snail, 
which to my Judgment was not bigger than an ordinary 
Grain of Sand, having the Figure of a common Egg. 
The Body of the Sniil was partly retrained and ex- 
tended again, which Motion happened in as little time 
as we may eafily pronounce a Word of Four Syllables. 
Seeing this, it came into my Mind, if this moving 
Body was not the Lungs of the Snail,which by the Refpi- 
ration was put intafuch a Motion, 
I 
