Thermo-electric Interpolation Formulce, 



483 



that for all of the expressions the deviations are systematic and 



not purely a accidental " in character. 



One of two inferences is therefore warranted : — 



1. That neither the parabolic, Avenarius, Barus, exponential, 



nor logarithmic equation is the natural expression of the 



function. 



B**us,** J $u 



Babus. 



A VEN. 



£xPOft. 



Logart- — 



2. Or that the scale of temperature to which the values of t 

 are referred in the foregoing investigations departs from the 



2L2 



