NOTES ON GRAVITY DETERMINATIONS. 
75 
The single Appalachian measurement suggests a question 
as to the hypogene changes connected with gentle arching 
of the surface, the question whether there is horizontal trans¬ 
fer of matter or only expansion. There would be much 
interest in the results of other measurements in the same 
region. 
A study of the anomaly at the fall-line promises to 
throw light on the general question of isostatic adjustment 
between regions of progressive degradation and deposition. 
For its prosecution there should be several stations on each 
side of the fall-line. 
