24G 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



which indicates the general behavior without, of course, the accuracy 

 of the formula. The general character of all these curves is the same, 

 showing a continually decreasing effect of pressure on change of re- 

 sistance as the pressure increases, this decrease itself also decreasing. 



TABLE VII. 

 Specific Volume Resistance of Mercury. 



The curves do not run to high enough pressures to justify any specula- 

 tion as to their ultimate behavior. 



De Forest Palmer's are the only results with which these can be 



1 A 7? 



compared. He found -= 'to have the constant value 3.224 X 10 -5 



Ro V 

 between and 2000 kgm.4 There is, however, as already stated, a 

 probable error of 1.5 per cent at 2000 kgm., and proportionally more 



* de Forest Palmer, Amer. Jour. Sci., 4, 8 (1897). 



