i96 Dr. M. Smoluchowski de Sinolan on 



considered to be uniform through its whole body) is defined 

 by the equation 



_c|?=(«L + <rS)0, 



which by integration gives 



if 6 Y corresponds to the time 0. 



The cooling in the best vacuum, in the time t„ is supposed 

 to be due only to radiation ; this gives 



■s-Jokgys 



whence 



«\=[H] clo 4 (2) 



L is given by the expression 



( e-0 o )L = -2^ P f p , 



where S means the temperature of the gas, 6 the temperature 

 of the glass vessel : since this must be independent of the 

 radius p, we must have 



p =r- = const. = a. 

 op 



which, together with the two equations for the boundaries 

 p=r and p = R, formed after equation (1), 



L-- . ", ,. (3) 



gives 



-f+rG-3 



The value of L, when 7=0, may be put L : 



The ratio of *L to the normal value « L at higher 



