[ 471 ] 
Extremities things are not to be feen fo diftin&ly. 
Towards the Head, about the Fifth or the Sixth Ring 
from it, the Artery appears but like a Thread, fcarcely 
difcernible, and which, ftill diminifhing continually 
till near the Mouth, there abfolutely ceafes to be 
vifible : But what ought mod to be taken notice of, is 
the prodigious Swiftnefs with which the Courfe of the 
Blood is accelerated in this Place 5 it feems as if it 
were darted forcibly into the Brain. Towards the 
Tail, for the Length of feveral Lines, it looks as if 
there was no longer any of the fame Play 5 thofe 
alternate Contractions and Dilatations, fo remarkable 
in the Middle of the Body, here confound them- 
felves with each other, fo as to be no longer diftin- 
guifhed : In the Bead of them one only fees certain 
Undulations or Layers, as it were, of Clouds, fuc- 
eeeding one another with great Regularity. 
Under every junction of the Rings, are to be 
obferved fmall Veftels with feveral Branches, all 
which feem to be Productions of the principal Ar- 
tery. 
All along and immediately under this Artery, is 
extended the Chanel of the Inteftines, lefs vifible of 
itfelf than by the terreftriai Matters with which it is 
commonly filled : It is furnifhed, like the Inteftines 
of larger Animals, with different Orders'of mufcular 
Fibres, which ferve to pufh on, and thruft out, the 
Remainder of the Food. If one does not difeover thefe 
Fibres by the Eye, one may, at leaft, know and judge 
of them by the EffeCls: One may fee with Amufe- 
ment, how the Excrements are driven on by degrees 
towards the Anus , the Tranfparency of the Skin 
difeovering eafily what is under it. However, by 
re a fon 
