94 ESSAYS ann OBSERVATIONS 
heights are known to be, as the fquares of - 
the velocities. When the velocities are, as 2 
to1, the heights are, as 4 to 1. But the 
forces are ftill to be eftimated, as 2 tor; 
fince the times which the uniform action of 
gravity takes to deftroy them, are in that 
proportion. Witha double velocity, and in a 
double time, the body arives ata fourfold — 
height. 
Wuat hath been here remarked, con- 
cerning the meafure of forces, is not fo 
much intended for the inftruction of thofe- 
who have had leifure to attend to this cele- 
brated controverfy, as to enable every one 
who has the {malleft acquaintance with thefe 
matters, to judge for themfelves; whether the 
common arguments, when rightly underftood, 
be fufficient for the decifion of the queftion ? 
or, whether there be {till occafion for a new 
folution of the difficulties? The debate has 
been clofed long ago; after being managed by 
the ableft advocates on both fides: and the 
fubjet is generally thought to be exhaufted, 
though no formal reconciliation hath hitherto 
been declared amongft the parties. We are 
now told, ‘* That by a profufion of writing, 
‘« the point is rendered fo perplexed and in- 
tricate, 
