euifhcd ; whereas every-where elfe, except about tnc 
Five or Six Firft Rings, the Parts in Queftion were 
plainly vifible : And efpecially the Stomach, by realbn of 
the earthy Subftance it was filled with. I have Rcalon. 
to think, that thele fmall Worms, oblerved again 
with frefh Attention, will Ihew me hill fomething 
new, in their internal Parts. I divided one on the 
28th of March, in the Place where I have fa id 
that the Vifcera appeared interrupted. Next Day 
the Two Pieces buried themfclves in the Mud ; and 
on the Firft of April, being both applied to the Mi- 
crofcope, the Latter was found to have already got 
a Head as well-formed as that of the other Piece, 
and which had already begun to perform its natural 
Office of giving Admittance to the Food. It is 
remarkable, that Worms fo tender, and fo Imaii, go 
through the Operation fo well, and complete them- 
felves fo fpeedily even in cold W eather. This confirms 
what I (hall obferve below, that the more (lender 
thefe Infeds are, the fooner they complete them- 
f e lves. 
This unexpeaed Obfervation fet me upon examin- 
ing more carefully the internal Parts of thefe Worms. 
With the Help of a good Magnifying-glafs, I thought 
1 diftinsuifhed, in the Inftde of one of the biggeft on 
both Sides of the great Artery, fmall Worms like thofe 
I have fpoken of above : I faw them move different 
Ways, extend themfelves, and wriggle about. But, 
having had recourfe to the Microfcope, I began to 
doubt whether that 1 had before feen was realiy 
what it feemed to be. It then appeared, that what 
I had taken for Worms, were rather the Branches 
.©-t thofe Veffels, accompanying the great Artery, 
R r r 2 and 
