226 PHENOMENA DEPENDENT ON MOLECULAR PATHS 87 



From the mean values of these numbers found for H 

 I have calculated the value of the coefficient of viscosity 

 ^ at 0, and thence the values of 77 at the temperatures of 

 the experiments in order to see if the formula 



77 = 77 (1 + o$)*, 



with the value of a, viz. 0-00367, which is satisfied by 

 gases, reproduces the observed values of the viscosity within 

 the limits of possible errors of observation. I have thus 

 obtained the following values of lO 6 ?? for the vapour of 

 benzol, which I have tabulated along with those observed 

 by Schumann and those also which are calculated by his 

 formula. 



IWrjfor Benzol Vapour. 



