( 208 ) 
was necelfary, (over and above their own, after 
they had been well foak’d in Water) tofeparate them 
at once from the Surface of ftagnating Water. I 
found 50 Grains to feparate a Surface of one Inch 
fquare ^ and the Weight in every trial being exa&ly 
proportional to the Surface, I was encourag’d to think 
the Experiment well made. The diftance of the 
under Surface of the Board from the Surface of the 
ftagnating Water, at the time they feparated, I found 
to be -4-v of an Inch j though I believe it would be 
found greater, if it could be meafured at a greater dif- 
tance from the Edge of the Board, than I could do 
it, the Water riling a little before it came qpiite un- 
der the Edge of the Board. 
♦»> 
FINIS. 
■1 ■ ■■■— ■ 1 —1 n .1 
LONDON: 
Printed for W. and J. Imys, Printers to the Royal 
Society $ at the Prince' s^Arms, the Weft- End* of 
St* p4uh*Qhurch*T<irct* 
