CONTRIBUTIONS OF GEOLOGY 217 



mining district, the Silesian coal fields, or other such large and 

 difficult questions ; or boundary problems involving the attribu- 

 tion of minor deposits like the Idria mercury mines, recourse 

 was had to the geologists attached to the delegations and to 

 the elaborate reports and maps they had prepared, for the data 

 needed as one element in making a fair readjustment of the 

 world's boundaries. Geology, like Geography, made good its 

 title to a place among those sciences which the governments of 

 peoples can not neglect, either in war or in peace. 



