Translation o/'Rey's Essays. 



2QI 



others touching it at F; and L L, two others touching it at G. 

 It is obvious, that the ball being at D, has upon it, besides its 

 own internal weight, the matter of the elements of air and fire, 

 contained between the lines H H; but when at E, there is 



all the matter contained between the lines I I, which increases 

 at F by the greater quantity contained between the lines in KK; 

 and when at G the weight of the whole, contained between the 

 r 2 



