578 JOHN F. HAYFORD 
was based. The authors of the gravity publication feel confident 
that such tests, if thoroughly made, will show that the assumptions 
in the published computations are very near the truth. 
The fact that the gravity observations confirm all the con- 
clusions previously drawn from deflections of the vertical is an 
exceedingly strong indication that there are no fundamental errors 
in the method of computation used in either investigation. 
