( 578 ) 
fame mannec ; the End of the Balance which carried 
the Veflel of Water funk as Toon as the Thread of the 
Plummet was cut ; tho’ this Glafs was not above half 
To long as the Tube 
When by holding the String I drew the Lead upwards 
and downwards in the Water, there was no fenfible 
Alteration of the y^quilihrmnt. Neither was it alter’d by 
cutting the String cf a Stone- Plummet, becaufe of the 
Shortnefs of the Glafs, and the little Excefs of fpecifick 
Gravity in the Stone ; for the greater the Difference is 
betwixt the Body made ufe of in this Experiment and 
Water, as well as the bigger the Body it felf is, the 
better the Experiment will fucceed. 
Hence it appears, that when a Body, fpecifically hea- 
vier than a Fluid, is (by what caufe foever) detain’d iti 
any Place of the faid Fluid, it adds as much to the 
Weight of the whole Fluid as an equal Bulk of the faid 
Eluid amounts to: And when the laid Body, by the 
Adion of its Excefs of fpecifick Gravity above the 
Fluid, defcends with an accelerated Motion; fo long as 
that Motion is accelerated, the Refiflance of the Fluid 
C which is as- the Square of the Velocity^ takes off 
Tomething of the whole Weight of the Body ; but as 
much as the Body lofes, fo much the Water gains, over 
and above what was given it by its rifing on Account 
of the immers’d Body. 
A Body therefore that falls in a Fluid is fo far from 
making the Fluid lighter as it falls, that it makes it 
prefs more upon the Bottom that fuflains it, when it is 
falling, than when it was at reft in the Fluid. 
If the Veflel of Water be long enough for the falling 
Body to come to an uniform Motion before it reaches 
the bottom, the Force impref ’d on, the Water under 
the Body will make it prefs the Bottom, as much as if the 
Body were adually at bottom ; the Body in that Cafe lo- 
fing 
I 
