Chase.] 



266 



[September. 



determined (1) by the gravitation disturbance, from the mean of the 

 therniometric extreme daily ranges (28 925), from the mean of the 

 observed ranges on land and at sea (25.015), from the differences 

 between the polar and equatorial mean temperatures according to 

 Johnston (25.55), or Daguin (25.431), or from the annual range 

 (31.04), — or (2) by the barometric disturbance, from the inter- 

 solstitial range (33.823), indicate an action on the atmosphere by 

 the sun's radiating energy, which is more than twenty-five times as 

 great as that which is due to simple solar attraction. The annual 

 and intersolstitial ranges involve periods of such length that the 

 differences of temperature may, perhaps, be more influenced by the 

 earth's centrifugal force than by the mere difference of gravity. If 

 the centrifugal force (794) is substituted for the difference of gravity 



Table II. — Average Daily Eange of the Thermometer. 



