1866.] 



265 



[Chase. 



turbances which are set forth in the previous tables, and contempo- 

 raneous disturbances of gravity or density. It exhibits a satisfac- 

 tory de<;ree of uniformity in the variously derived results, consider- 

 ing the limited extent of the observations, the usual crudity of first 

 approximations in science, and the amount of disturbance that must 

 necessarily arise from atmospheric currents. The ratios, vyhether 



Table I. — Continued. 



Sabine. 

 Blodgett. 



« Kaemtz. 



d Bache, 1842-4. 



e Looinis. 

 f Guyot. 



