EQUATION AND THE NATURK OF COHESION. 



61 



sure and volume and in other ways are too numerous to be a 

 matter of chance. It is certainly not a matter of chance that if we 

 compute the value of a of benzene from the gravitational mass of 

 the molecules and the number of valences we arrive at the figure 

 2Q.73 X 10 12 dynes for a gram mol, whereas the various ways of deter- 

 mining this value directly from the surface tension, from the latent 



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0.5 Q857 1214 1.57/ 1.928 2.285" 2.642 300 3.357 3.7/4 4.071 



heat and in other ways show the same results, i. e., 20.40, 20. GO, 

 20.48, 19.17, 20.95 X10 12 . Or if we compute the cohesion of 

 a different kind of substance, ethyl ether, from the gravitation and 

 valences we find it to be 19.12 X 10 12 dynes; whereas from the 

 latent heat, from the surface tension, from the critical data, from 

 the behavior of the gas when heated under constant volume we 



