302 THE CHEMISTRY OF THE SUN. [CHAP. xxi. 



which can be kept out of the reaction by careful low tempera- 

 ture distillation. Not only do these new results indicate 

 an almost undreamt-of variability in spectra, but so far as I 

 can see they are simply and sufficiently explained on the 

 assumption that the elementary bodies in the solid state con- 

 sist of various sets of molecules which behave like mixtures of 

 organic compounds. 



