1866.] 



269 



IChase. 



posed elastic medium, the attractive force of each particle, at the 

 centre of elasticity, is four times as great as the mutual attraction of 

 the particles for each other. 



4. The velocity of light is nearly the same as the velocity which 

 would be acquired in one year by a fallinp: body, under the influence 

 of an accelerating force equivalent to the firce of gravitation at the 

 earth's surface (32^ X 8G400 X 3G51 ^ 5280 = 192254 miles per 

 second). This is perhaps merely a curious accidental coincidence. 



5. There is probably a daily flow of the expanded air, at noon, 

 over the cooler and denser air, eastwardly and westwardly. Some 

 physicists have thought that this overflow is sufficient to account for 

 the daily barometric tides. 



6. The I momentum ) ^^ ^j^^ atmosphere, in the direction 



[ moment or inertia j ^ 



of its orbital motion, is about I fi9Q000000 I ^^ 

 which is due to the earth's daily rotation. 



mes as great as that 



Table V. — Eatios of Temperature- Variations to Varia- 

 tions IN Gravity or Specific Gravity. 



a Variation of temperature eorresponding to the variation of atmospheric 

 volume which is due to solar attraction. 



b Temperature-variation corresponding to the difference between the polar and 

 equatorial attractions 



c Temperature-variation corresponding to the barometric intersolstitial vari- 

 ation. 



d Average daily land range of temperature. 



* Temperature-variation corresponding to barometric annual range. 



