EFFECT OF PRESSURE ON CONDUCTIVITY OF METALS. 127 



in a metal is performed by the atoms. Theoretical reasons are given 

 for estimating the atomic contribution to the thermal conductivity as 

 50 per cent of the electronic contribution. 



I am much indebted to the skill of my assistant Mr. J. C. Slater, 

 who made a large number of the readings. It is also a pleasure to 

 acknowledge my indebtedness to the Rumford Fund of the American 

 Academy of Arts and Sciences for a grant with which a part of the 

 expenses were defrayed. 



1 P. W. Bridgman, Proc. Amer. Acad. 52, 571-646, 1917, and 56, 59-154, 

 1921. Phys. Rev. 9, 269-289, 1917, and 17, 161-194, 1921. 



2 S. Lussana, Nuo. Cim. 15, 130-170, 1918. 



3 C. Niven, Proc. Roy. Soc. 76, 34-48, 1905. 



4 P. W. Bridgman, Proc. Amer. Acad. 53, 267-286, 1918. 



5 G. Borelius und A. E. Lindh, Ann. d. Phys. 51, 607-620, 1916. 



6 Reference 1, fourth paper. 



The Jefferson Physical Laboratory, 

 Harvard University, Cambridge, Mass. 



