212 



PROCEEDINGS OP THE AMERICAN ACADEMY. 



dsecribed as follows. If the equation be made to conform to the data 

 at 0°C. and at two higher points, a and b, then the deviation will be of 

 the negative sign from to a, positive from a to b, and negative above b. 



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The slight departures from this general form are clearly due either to 

 accidental errors, or to failure to make the equation conform to the 

 data at all three points, or at suitable ones. The evidence is there- 

 fore conclusive that /br all of the expressions the deviations are sys- 

 tematic and not purely ^'■accidental" in character. 



