504 T. C. CHAMBERLIN 



of the iron and allied metals into masses of moderate dimensions 

 distributed through the stony material, after the fashion of the 

 metallic and stony material in meteorites, would probably affect 

 appreciably the transmission of transverse seismic waves, and so 

 account for the peculiarities of the record of such waves as come 

 through the hea.rt of the earth quite as well as the assumption of a 

 purely metallic core. An original mixed constitution from center 

 to surface kneaded into the present solidity by differential stresses 

 whose central intensity is to their surface intensity in about the 

 same ratio as the central density, rigidity, and elasticity is to the 

 surface density, rigidity, and elasticity seems to fit the requirements 

 of the case. 



