198 Of th SOLIDS 
fore alfo the attra¢tion of the folid, (which is & a) = “ mf = 
* 
=m (4shahe 3 eee (42-3%=* 30x jan Vee. 
5-47 Be, 
AGaIN, if m be formed into a fphere, the radius of that 
; 3 < e A . 
{phere = Ni = and the attraction of it ona particle at its 
m3 
furface = nz (3 -)? = os a 
Hence the attraction of the folid ADBH, is to that of a 
{phere equal to it, as m (e eye to m (=) 5 5 -EHAt, 36, ae 
(27)? to (25), or as 3 to the cube-root of 25. 
THE ratio of 3 to W 25, is nearly that of 3 to 3 — ae or 
27 
of 81 to 79; and this is therefore alfo nearly equal to the ratio 
of the attraction of the folid ADBH to that of a fphere of equal 
magnitude. 
VIIl. 
Ir has been fuppofed in the preceding inveftigation, that the 
particle on which the folid of greateft attraction exerts its force 
is in contact with that folid. Let it now be fuppofed, that the. 
diftance between the folid and the particle is given; the folid 
being 
