330 



THE CHEMISTRY OF THE SUN. 



[CH. xxiv. 



* Sometimes reversed. 



The above tables then clearly indicate the considerable 

 differences which have been noted by former observers touch- 

 ing the various appearances and intensities of the lines of 

 iron as seen in sun-spots and prominences respectively ; but 

 it might be imagined that when we use the highest tempera- 

 ture available here and contrast the spectrum thus obtained 

 with that given us by the prominences, that here at all events 

 we should get a closer agreement. The map given on the next 

 page will show that this is not so, and that there are the 

 greatest divergences of intensity between lines seen under 

 these two conditions ; that many of the lines seen in our 

 laboratories when a chemical element is studied and therefore 



