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and numberlefs other Variations, are ail employ'd 
for His Purpofes, and modelled by that Almighty 
Power, which forms and direds the Whole. • 
Thus do thefe Principles, however capable of 
differing Combinations, yet admit only of a limited 
Variation, and never deviate further than is confid- 
ent with univocal Generation. Monders, Mules, im- 
peded Foetus's , and other Indances of this kind, are 
but rare 5 and as they can be aferib’d to nothing fo 
properly as to the Obftacles they meet with, or to 
fome accidental infuperabie Refinance in the Mat- 
ter of which they are formed, they do at lead ferve 
to fhew that there is in Nature a real produdive 
Force given it at its Creation 5 and that animal or 
vegetable Produdions are not the Confequences of 
pre-exiftent Germs, plaftic Natures, or of the imme- 
diate Hand of God himfelf, any more than the mod 
regular Operations of the Planetary World. 
§ 30. But to proceed in my Confequences from 
thefe Obfervations, all Naturalids mud acknowlege, 
that the more compounded the organiz'd Bodies are, 
the lefs Danger there is of equivocal Generation in 
the Produdion of them 5 for thus the immediate 
Principles from which they fpring, and their Cir- 
cumdances during the Time of Gedation, mud be 
much more varied than the more -dmple Bodies 
are, and at the fame time be further removed, from 
that univerfal Element into which they may all ulti- 
mately be refolved : And even in the lowed Clafs of 
microfcopical Animals, I can truly fay, that 1 never 
yet obferved any others than Produdions fpecifically 
determined 5 the fame Subdances giving the fame 
Plants and Animals, and in the fame uniform Or- 
