480 Scientific Proceedings, Royal Dublin Society. 



Even at the estimated temperature of the sun at 3000° 0. this would 

 be still only 



c = 5-2x 10-^; 



but it is evident that if the specific heat of the matter in a gas is 

 at all nearly constant up to these temperatures, a very large part 

 of the heat energy would be in the ether if the gas were rare. 

 This is what one would expect in considering temperatures of spark 

 discharges, and accounts for their very short duration. 



It is quite easy to apply the same considerations to calculate 

 these quantities upon other laws of cooling, but this whole subject 

 is so uncertain it is hardly worth doing more than point out 

 what is to be done. 



