PROBLEMS ON THE BORDER LINES BETWEEN GEOLOGY 

 AND THE OTHER SCIENCES. 



BY GEORGE F. KAY. 



(Abstract.) 



In this paper attention is called to the need of co-operative work 

 among investigators in the different fields of science. Reference is made 

 to several bulletins and papers which have already been published by 

 the chemists of the United States Geological Survey, by the physicists 

 of the geophysical laboratory, and by other scientists, throwing light on 

 many problems in geology which heretofore were obscure. The neces- 

 sity for further work upon border problems, already under investiga- 

 tion, and upon many other problems which need solution, is emphasized. 



