[. 66o ] 
tiering to the Subftances infus'd } I have often, for 
thefe Purpofes, made ufe not only of hot Broth ’ im- 
mediately clofed up in a Phial, but alfo of pure ani- 
mal Subftances, fuch as Urine, Blood, with the 
fame Succefs; and in thefe, I believe, no one will 
fuppofe that Germs, Eggs, or Spawn, are pre con- 
tain d, if Care is taken to clofe the Phials imme- 
diately. 
Nay I have done more; I have, by reafoning 
consequently to my Principles, been dir eded to the 
Choice of many Experiments, all which 1 conflantly 
found to anfwer my Expedation : I have thought, for 
inftance, that the more exalted an animal Subftancc 
was, by a certain Degree of Decompofttion, the 
more apt would it be to vegetate in a proper Ma- 
trix, and form the Part of a larger Animal i or, if 
it extravafated, to vegetate into the lefler; confe- 
qucntly, that if I took the milky Juice of germing 
Seeds, or that thick turbid Matter which forms the 
Wing of a Butterfly in its chryfalidal State, thefe 
Matters muft be more exalted than any ordinary 
Subftances, and therefore give me thefe microfco- 
pical Produdions fo much the fooner: And in fad, 
I never, in thefe Cafes, fail'd of feeing them within 
the Space of a few Hours, while ordinary Infufions 
did not give them under feveral Days. 
Here it will be proper to obferve, that Natu- 
ralifts have thought the Butterfly's Wing pre-exiftent 
in the Caterpiller, becaufe they difeover’d the firft 
Rudiments of it three or four Days before it enter'd 
the chryfalidal State; but it is then precifely that 
the Caterpiller firft leaves off eating, tho' before 
extremely voracious ; and that probably upon ac- 
count 
