

PKOF. BOM U CA,.,.KN-.,AK ANI> M,, HBUMT MOSS 



The last observations give the mean coefficient from -10'5 C. to + 1G'1 C., which 

 is practically the same as the actual coefficient at 2'8 C. The values are expressed 

 by formula (2) in terms of the volume at -10'450 C. When expressed in terms of 

 tin- volume at C. by formula (3), the values become 



Means . . . [,a s ] (/,-/,) = 0'0047958. [,,] = "000 180572. 



8. Empirical Foivnulre for the Expansion of Mercury. 



An empirical formula representing the first two series was calculated in the first 

 instanct- liy the method of least squares. This method was adopted by WtJLLNER 

 and BKOCH in reducing KMSNAULT'S observations, and was fairly appropriate in that 

 case, because the main source of error lay in measuring the small difference of level 

 in the gauge. In the present series of experiments, the fact that the difference of 



