198 Of the SOLIDS 



fore alfo the attraction of the folid, (which is ^- a) = ^ m J -£ 



5 5 V 4* 



- 'J cT ' 2 5 



Again, if m be formed into a fphere, the radius of that 

 fphere zz'm V — , and the attraction of it on a particle at its 



m 



(ioVY 



furface = (j_U = « 



Hence the attraction of the folid ADBH, is to that of a 

 fphere equal to it, as m (i- *)~* to m V~~~) T ', that is, as 



I i 



(27) T to (25) 3 , or as 3 to the cube-root of 25. 



The ratio of 3 to v 25, is nearly that of 3 to 3 « ?-, or 



2 7 



of 8 1 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. 



VIII. 



It has been fuppofed in the preceding inveftigation, that the 

 particle on which the folid of greater! 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- 





