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Knowledge of the coarfer fort of Nature’s Opera- 
tions, but the Niceties, the Particulars of them, 
efcape us. If we endeavour to pufh our Knowledge 
fo far, we find ourfelves furrounded with Clouds, 
we grope in the dark, and it is very difficult, if not 
impoffible, to catch Nature in the Fad. It even 
feems, we have had better Succefs in determining 
what Nature does not do, or cannot do, than in, 
fpecifying what flie adually docs. 
The Human Body is a Compound of Springs, 
which produce very regular Motions : Yet thefe 
Springs themfelves we do not know but very fuper- 
ficially, and are far from knowing how thofe Mo- 
tions are produced. We know, that we are born,, 
that we exift; but how came we to this Exiftence? 
How were we produced? The Generation of Man- 
kind’ Ojud of Animals is one of thofe "Thanomenai 
where innumerable Experiments have not been of fo 
great Uie, as they are elfe in other Thanomena of 
Natural Philofophy,, for difcovering their moft fecret 
Springs,! 
It is ftill a Difpute, whether the Male or the Fe- 
male: contributes moft towards Generation. It is 
certain, that for the Generation of Mankind there 
mufi be a Male and a Female, and it is the fame thing 
with regard tq tfiat of Brutes. There is all the Rea- 
fon in the World to believe, that what is written 
about Hejrinaphrodites, and about thofe Animals 
which,; being endued with the Advantage of the two 
Sexes, produce alone their Like, has not been exa- 
mined with all the neceffary Attention and Exaftnefs. 
Sepien o| Man, which is certainly a moft 
neceflary Agent for Generation, becaufe it has been; 
ohr 
