( 7H > 
makes it evident u hy the Intcftinc, which makes no 
Revolutions, and yet referves ordinarily but liquid Ali- 
ments, does yet retain them to a perfed Concodioo and 
retains them fo long. 
A Nerf the Bigne(s of a Horfe Hair, all Black, hard 
to break, having Knots at a Dtftance, one from the 
other, beginning at the Mouth of the Animal, pafTcs 
over the Parts that fer/e for Generation in the Male, 
'tis faftned in a ftreight Line all along the Gut above, 
ends at the little Circle in the end ot the Tail, and in 
the Way (ends out Branches to the Right and Left Side, 
Vv^hich go from every Knot. 'Tis very probable that 
by this Canal, the Animal Spirits run abundantly, which 
gives fo great Brisknefs to this Reptile, which make it 
ply in fo many FaQiions, Swim fo fwiftly, fo properly, 
and Suck with fuch Grcedinefs. 
All we have faid hitherto, is nothing in Comparifon 
of what we have to Ciy further of its Beauties. The 
Leech is Hermafrodite ; the Parts of the Male deftina- 
ted to Generation, are plac'd where the Neck ought to 
be. The Yard, which is about Two Inches long, is 
White, Round, Hollow, and Griftly ; a part of the 
Yard which is always in the Body, is a Sheath about 
Fifteen Parts of an Inch, long, as big as a little Birds 
Quill, covered with a fine Membrane, which faftens 
it ftrongly to the Belly, round about a little Hole given 
the Leech for putting out and in his Yard when he plea- 
fes, and not for Breathing, as the Ancients faid. The 
other Parts of the Yard which comes out Nine or Ten 
Parts of an Inch, is the Bignefs of a (owing Thred, and 
the End of it for the Length of Two Parts of an Inch, 
is bigger than the refl:. All the Yard is hollow, and 
has in its Cavity a White Mufcle as big as a Hair, faft- 
ned only to the Root and Head, all the reft being at 
Liberty. 'Tis with this Mufcle that the Animal draws 
the 
