C 6 3 7 3 
at this time groundlefs, yet afterwards proved to be 
falfe. Thefe, and the fpermatic Animals, we fup- 
pofed to be of the latter kind ; and to be produc’d 
in their refpeCtive Fluids, by a Coalition of aCtive 
Principles, much as I had feen the Calamary Ma- 
chines form’d by Hundreds, tho’ abfolutely detach’d, 
and fwimming at Liberty in the Milt of the Fifh : 
whillt we thought on the contrary, that the ordinary 
microfcopical Animalcules, with llrong Characterises 
of fpontaneous Motion and Animation, were to be 
clafs’d among Animals, and imagin’d them to proceed 
from Parent Individuals of their own Species. It was 
not till fome time after this, that, determin’d to con- 
vince myfelf and others, without any Poflibility of 
Doubt, whether thefe moving Atoms were really pro- 
duced from without, or from the very Subftance 
infus’d : I difeover’d all the common microfcopical 
Animalcules, the fpermatic ones not excepted, were 
to be rang’d in the fame Clafs, and that their Ge- 
neration was very different from that of all other 
animated Beings. 
§ 21 . For my Purpofe therefore, I took a Quan- 
tity of Mutton-Gravy hot from the Fire, and (hut 
it up in a Phial, clos’d up with a Cork fo well 
mafticated, that my Precautions amounted to as 
much as if I had fealed my Phial hermetically. I 
thus effedually excluded the exterior Air, that it 
might not be faid my moving Bodies drew their 
Origin from InfeCts, or Eggs floating in the Atmo- 
fphere. I would not inftil any Water, left, without 
giving it as intenfe a Degree of Heat, it might be 
thought thefe Productions were convey’d through 
that Element. Seeds or Plants were for this Rea- 
fon 
