154 BRIDGMAN. 



The aflditional evidence from these new materials still gives every 

 reason to think that the amplitude of atomic \'ibration is the largest 

 single factor in determining the changes of resistance under pressure 

 or temperature. 



The Jefferson Physical Laboratory, 

 Harvard University, Cambridge, Mass. 



1 P. W. Bridgman, Proc. Amer. Acad. 52, 571-646, 1917, and Phvs. Rev. 9, 

 269-289, 1917. 



1 regret that through an inadvertence on my part I stated in the first of 

 these papers that the previous work of Lisell and Beckman contained a source 

 of error due to the permanent closing of the batter}^ current. Dr. Beckman 

 has been so kind as to call to my attention that this error was present only in 

 the preliminary work of LiseU, and was not present at all in the final results of 

 Lisell, or in any of his own results. 



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