238 PHENOMENA DEPENDENT ON MOLECULAR PATHS 90 



and with these values I calculated from the formula the 

 following values of the coefficient of viscosity which, as 

 before, I tabulate opposite those observed : 



Carbonic Acid. 



If we compare the numbers in these tables with each 

 other we at once notice a certain contrast in the behaviour 

 of the numbers as calculated by the two formulae. For 

 smaller values of the pressure which lie below 70 atmo- 

 spheres, only the formula with variable A and B is satis- 

 factory, the other with constant A and B being certainly 

 not. At higher pressures, however, the formula with 

 constant A and B corresponds with the observations very 

 much better than the other, which gives values that deviate 

 widely from the truth. 



