30 



XUE bTBUCTUUK Ol- TllJE JiUCLEUS. 



111. 



particles. Table -i contains tlie results, tlie exhaustion being from 76-58 c 

 Where ditt'ereut colors were seen, which may be either errors of judgment or real 

 differences <>f contiguous coronas, this is usually note<l by inserting l)oth colors on 

 the same line. The colors being very fleeting it is out of the question to await 

 rigorous isothermal conditions; neither is it certain that the colors were caught for 

 the adiabatic state of compression. A small allowance of time after exhaustion 

 must be granted for judgment. Hence the computations will be made Itoth for 

 isothermal and for adiabatic conditions, leaving the true result to be derived l>elow. 

 The feneral agreement of coronas seemed to vouch for this method of combating, 

 partially at least, an inherent difficulty. The third column of the taVjle shows 



.y = 0'/fo)'- 



TAULE 4.— COLdR SEQUENCES OF SUCCESSIVE CORONAS. 

 EXHAUSTION 76-58 cm. 



Ignoring decay and similarly spontaneous time losses due to the motion of the 

 nuch'us, theie is here given .-i scale of optical effects related to the nuclei in a given 

 volume of air saturated with aqueous vapor and to the given exliaustion.s. As 

 more nuclei are present the condensed water globules are finei-, lemembering that 

 tli<- medium is always identically super-.saturated. For this and other reasons (re- 

 heating of the adiabatically cooled air), oidy the MKMiieiitarily fixed corona follow 



