Mr. Genet’s Vindication. 95 
ted under a foreign revolutionary impulse, are indirectly con- 
verted into an undisciplined ambition to rank with the philos- 
ophers and sages of the earth, I feel myself bound in duty to 
those who have, with less prejudice, investigated and counte- 
you then, Sir, to grant me some room i your Journal, to 
Boston reviewers, Sir, after a short exordium on the 
intrinsic value of all discoveries in the arts and sciences, and 
other very judicious remarks on the too frequent mistakes of 
those who flatter themselves that they have made discoveries 
of greater value than future ages will assign to them, express 
a desire to act towards me with humanity, and to analyse my 
pamphlet with a respectful attention. But unfortunately, on © 
their first step, they are stopped short in their charitable in- 
; oe ; 
. of upward forces in fluids, the one due to the principle of 
gravity, the other to what I call the principle of levity. The 
first is the mechanical result of the pressure of the heaviest 
particles against the lightest, which makes them push the lat- 
ter upwards, by virtue of a centripetal force, which draws the 
of the unknown cause of levity. The second seems, in my 
