20 W. Bowie — Relation of Isostasy, etc. 



Topography compensates deficiency or excess m isostatic shell. 



Mr. R. D. Oldham, in discussing a paper^ on isostasy 

 presented before the Eoyal Geographic Society by Col. 

 Burrard, emphasized the importance of stating clearly 

 whether a monntam is compensated for by the defi- 

 ciency of material in the colnmn nnder it, or whether 

 the mountain is a compensation of the light material of 

 the colnmn. Geodesists have spoken of compensating 

 deficiencies of material nnder the continents and compen- 

 sating excesses of material nnder the oceans, bnt it is the 

 writer's belief that the mountain masses and the defi- 

 ciency of matter in the oceans compensate the abnormal 

 conditions of density which exist in the columns under 

 them. 



^ A Brief Eeview of the evidence on wMeli the theory of isostasy is based. 

 Geographic Journal, July, 1920, London. 



