XX rjje P R E FA C E. 
Archited, the Traces of which are 
fo plain to be feen in every Thing, 
that the Pfalmijl had good reafon to' 
call him a Fool who could be fo 
fenfelefs as to Jay in his Heart that 
there is no God ; whofe raafterly Hand 
is fo evident in every Part of Nature,- 
that if there be any who pretend they 
cannot fee it, it can be no Breach of 
Charity to fay that they are wilfully 
blind, and therefore Lyars. 
In the Treatife on the Calculus^ I 
have endeavoured by a great Variety 
of Experiments, to enquire into the 
Nature of that rnoft formidable Con- 
cretion; but tho’ 1 have not thence 
been able, to find out either a fure 
Preventive, or a fafe Difiblvent, yet 
I am not without hopes that thefe 
Relearches, as they were fincerely 
intended, fo they will prove of con- 
fidcrable Benefit to Mankind in many 
Cafes, 
