[ 48 . ] 
kept themfelvcs conflantly folded together. I would 
not, however, venture to determine any thing upon 
this, tiil I am better fatisfied by new Experiments. 
IX. A Twig of Willow , Toplar, &c. planted in the 
Earth, takes Root there, and foon becomes a Tree, 
the leaft Twig of which will, in its Turn, become 
another. There is no End of this; and it is the fame 
with our Worms. If we cut thofe that have been 
produced by Se&ion, and do not carry the Divifion 
at once beyond Twelve or Fifteen Pieces, we fhail 
not fail of having lo many Animals. I have had 
Worms from the Fifteenths, and even the Twenty- 
fourths, of former Halves and Quarters ; and l reckon, 
that in Two Years time I mighr, if I would, breed 
after this manner Forty or Fifty thoufand Worms 
from one lingle one. 
X. But how do thefe Worms propagate ) Are they 
viviparous or oviparous ? I fhail juft mention an 
Obfcrvation that to me leemed lingular : As I divided 
one of thefe Worms into Eight Pieces, I faw fome 
earthy Matter oufrng out of one of the Pieces near 
the Head, in the midft of which I perceived fome- 
thing moving like a whitifh Thread. I, at firft, made 
no doubt but it was fome Vellel, or like Piece 
of the Body of the Infedf, which, not being quite 
feparated from it, might hill draw from thence the 
Principle of its Motion : But, taking to my Affiftance 
a good Magnifying- glafs, I was much furprifed 
when I faw, that this fuppofed Vellel was a fmali 
Worm, and exaftly of the Figure of that, in the 
Body of which it had before been inclofed. I 
immediately refolved to bring it up; and, to this 
End fet it apart in a fmali Vellel filled with Water, 
R r r * into 
