C 47 8 3 
VI. It is certainly very lingular, that the Circula- 
tion of the Blood, the Regularity of which appears 
1 o effential, yet in certain Infe&s Buffers confiderable 
Changes. Such are thofe which Malpighi has ob- 
ferved in the Silk-worm. And I do not know if 
it is not as remarkable, that thofe I am fpcaking of, 
have never fhewed me any of thofe Variations, at 
whatever Time, or in whatever State I have yet 
obferved them, either whilft intire, or when cut into 
feveral Pieces. I have conflantly, in all thefe Cafes, 
feen the Liquor that ferves them inftead of Blood, 
circulate from the Tail towards the Head, and that in 
Pieces which were fcarccly half a Line in Length, or 
which, to fpeak more properly, were only Granule of 
Flcfli. 
I was, by this, able to diflinguifh the anteriour End 
from the pofteriours and to be as fare as poflible, 
that it is always the anteriour, on which the Head 
appears again. 
VII. Among thofe Plants that may be raifed from 
Slips and Cuttings, there arc fome that feem to have 
this Property to fuch a Degree of Perfe&ion, that the 
leaf: Twig will become a complete Plant again. 
Hath the great Author of Nature, when He or- 
dained, that certain Infe&s, like our Worms, Ihould 
refemble thofe Plants in this Particular, allowed them 
the Power of being reproduced to the fame Degree? 
- Or, which is the fame thing, will this Reproduction 
rake place in whatever Part the Worms are cut? I 
have thought this worth inquiring into. In order 
to it, I cut off from one of thefe Worms both the 
Head and the Tail j that is to fay, I parted from 
each of its Extremities a Piece of the Length of 
about 
2 
