SOLUBILITY OF EARTHS BY WEANS OP SUGAR. A 



particle at H is precisely half as great, as if all the parti« 

 cles within the hcmisphe|^e of cohesion were situate in the 

 line H D. If we take H M = A D, and make the ordi- 

 nate A N every where proportional to the content of the 

 conoid corresponding to the distance A H, the curve M N 

 will approach at M infinitely near to a parabola, and at O 

 will become parallel to A H ; and the area A M N will ex- 

 press the sum of the attractions of a series of particles ex- 

 tending froui M to A, and consequently the proportional 

 attractive force of two solids situate at the distance A ti- 

 lt is easy to show, by a fluxional calculation, that the area 

 H M (3 is half of the rectangle MHO, and consequently* 

 that the mutual action of the substances when in contact, is 

 half as great, as if all the particles of the one body withia 

 reach of the cohesive force of the other, were situate imme- 

 diately at its surface. 



If one of the bodies be equal in thickness to the distance 

 to which the cohesion extends, it will still be attracted by 

 the whole force of the other: but if its thickness be lesp, 

 and equal, for example, to A H only, the attraction will be 

 expressed by the area A H O N only, which is ultimately to 

 the whole area H M O as twice A H to M H. This is per- j^x's a © nts 

 haps the reason, why the superficial particles of liquids are f^r the process 

 easily detached by the action of heat, in the process of slow "jfj^^"^ ^^^^* 

 evaporation. 



I am. Sir, 



Your very obedient servant, 

 20 Julf/, IS07. ' ALETES. 



II. 



On the Soldbilky of some of the Earths hy means of SugOr, 

 By Mr, William Ramsay. 



SIR, Clasgowy July 14, IQ07^ 



i^HOULD you think the following experimeTits, on the 

 solubility of some of the earths by means of sugar, worthy 



of 



