C 26s ) 
■find the Perpetual Motion. Tho’ fuch Perfons may 
make fome Difcoveries, their Philolbphy will be at 
belt but conjedural, and their Conchifions onlyguefs- 
work. The mere Mathematician on the other band, 
wants Fofiulata in Phyfics ; or taking things lor 
granted upon the Reports of others, comes olten to 
wrong Conclufions, tho’ he reafons juRly ; becaufe his 
Premifes are falfe ; Whereas he might have been let 
right in feveral cafes, by only obfervingthe Operations 
of Handy craft-Workmen, which he had over look’d or 
defpis^d. Men of warm Imaginations, who wanted 
Mechanicks or Mathematicks, or vvou’d not apply them 
to Phyltcks, have pefter’d the Learned W^orld with 
Philofophical Romances, fuch as the Cartefan Syfferri, 
contriv’d for the Diverfion of the lazy and talkative ; 
or Modern Theories, w'hich their Authors, blinded by 
Vanity, and urg’d by Obftinacy, have defended to the 
lad, againft Reafon, Mathematicks and Experiments ; 
nay, and have often for the Support of their Hypothe- 
fes, contriv’d complex Experiments, from whole Inac- 
curacy they have drawn Arguments to deceive them- 
felves and others, as much to the difadvantage of true 
Pbilofophy, as the Scholaftick Difputes of the Arijlo- 
telians; in which, Vitdory, not Truth, was contended 
for. 
But the incomparable Sir Ifaac NevotoH has not only 
fhorten’d the Geometrician’s Work, by his wonderful: 
Difcoveries in abdratd Mathematicks j but lias alfo 
taught us, by his own Practice, how^^ to make, and 
judge of, Experiments and Obfervations with the uc- 
molt Accuracy ; Ancj as he avoided making Hypothefes 
he w'as fo cautious as to deliver only by way of Que- 
ries, feveral Truths which he was convinc’d of; becaufe 
he wanted a fudkient Number of Experiments to make 
them as evident as thole others, whereby he has fo? 
far 
