( 44 ) 
pared asufual, the Tube being held over the Line^at 
fever 1 Diiiances, beginning towards that End .where 
the Bail hung, and io proceeding towards the farther 
End of the Line, the Leaf- Brafs was attracted at the 
Stations not exceeding two or three hundred Feet, pretty 
(trongly ; but (till grew weaker as we came towards the 
farther End of the Line : Yet even at the End of the Line 
the Leaf-Brafs would be lifted by the Ball, when the 
Tube touched the Line, whofe Length was 886 Feet. 
I (hould now have given fome Account of the Dif- 
covery. I made the lad Year concerning the Attraction 
of coloured Bodies, (hewing that they attract more or 
lefs, according to what Colours they are of, though 
the Subdance be the fame, and of "equal Weight and 
Bignefs ; only I (hall obferve, that I find the Red, 
Orange or Yellow, attract at lead three or four 
times ftronger than Green, Blue or Purple : But ha- 
ving very lately found out a new and more accurate 
Method of making thefe Experiments, I mud beg Leave 
t<$ proceed farther with them, before I communicate 
them. I am, 
S I R, 
charter-Houfe, Tour Humble Servant , 
Feb. t, i7It« 
Stephen Gray. 
9 
VI. Cur- 
