( ) 
always arife that Cylinder of Water, yet there is 
always a Steam of invifible Particles thrown on the 
Tube, and fometimes to that Degree as to be vi- 
iible on it. When fome of the larger Cups are 
made ufe of, they are to be filled as high as may be 
without running over: The Surface will be flat about 
the middle Part, but when the Tube is held over 
it, the middle Part will be deprdfed into a Concave, 
and the Parts towards the Edge be raifed ; and when 
the Tube is held over againft the Side of the Water, 
the little conical Protuberance of Water iffues out with 
its Axis horizontally, and after the crackling Noife, 
returns to the reft of the Water, and fometimes there 
will be thrown out of it fmall Particles of the fame, 
as from the fmaller Portions of Water above mention- 
ed. I am, 
SIR, 
, i '» . j 5 H ' , * .. . . i. 
The Society's , and Tour mofi 
Obedient Servant, 
Stephen Gray. 
i . ' { i - I I 
CJJ 
