400 Mr. Genet’s Vindication. 
and rail-ways, which induced Fulton himself to abandons 
them. 
From this Jast specification of my patent, the reviewers pass 
to what they call the conversion of the zrostat into an hydros- 
tat, and to the use I propose to make, for the navigation of 
lakes, rivers, and seas of that new power, increased by the 
superior upward forces of water against atmospheric air, and 
of atmospheric air against hydrogen gas. But here permit 
me, Sir, to enter a protest against their veracity as reporters. 
When their duty was to give an exact deseription of the ex- 
periment upon which this new application is founded, they 
present an erroneous one, evidently intended to make their 
readers believe that the said experiment is contradicted by the 
very principles of hydrostatics, that I have myself offered in 
the introduction of my Memorial as a test, in order to enable 
those who should not be acquainted with those principles to 
judge if I had made a discreet and correct use of them, ‘TI 
principle to which I allude is, that a body immerged in wa- 
ter loses a portion of its weight, eqnal to the volume of water 
it has displaced, and as the weight of a cubic foot of common 
fresh water is, in English weights, 623 pounds, it follows 0 
upward or uplifting force has diminished in proportion to the 
pth of water under which it was planged, losing, under 
‘the pressure of an incumbent foot of water, about one third of 
its force. The opposition of the water to the intruding air, 
and the disinclination of the air to be forced below its stra- 
tum, would seem, accordingly, if my experiment has beer 
correct, to be proportionate to the base or inferior area of 
tydrostat, and to the principle of levity of the air subject to 
the various degrees of intensity Of the Huids m contact, We 
differ on the words sinking and floating, which every swim- 
