ASTRONOMY FOR 1889, 1890. 



155 



of iron found also in the solarspectruui. Iron is followed by nickel, titan- 

 ium, manganese, chromium, cobalt, carbon, with decreasing frequency of 

 coincidences, ending with lead and potassium, for which but one line is 

 found in common with the sun. 



The full list of elements in the sun, arranged according to the inten- 

 sity and the number of lines in the solar spectrum, is as follows : 



Elements in the sun, arranged according io the intensity and the number of lines in the 



solar spectrum. 



Iridium. 

 Osmium. 



Doubtful elements. 



Platinum. 

 Ruthenium. 



Tantalum. 

 Thorium. 



Tungsten. 

 Uranium. 



Bromine. 

 Chlorine. 



Not in solar spectrum. 



Antimony. 



Arsenic. 



Bismuth. 



Boron. 



Nitrogen (vacuum tube). 



CiBsium. 



Gold. 



Indium. 



Mercury. 



Phosphorus. 



Rubidium. 



Selenium. 



Sulphur. 



Thallium. 



Preajseodymium. 



Substances not yet tried. 



Iodine. 

 Fluorine. 



Oxygen. 

 Tellurium. 



Gallium. 

 Holinium. 



Thulium. 

 Terbium, etc. 



Professor Kowland says : " With the high dispersion here used 

 the 'basic lines' of Lockyer are widely broken up and cease to exist- 

 Indeed it wouhl be difficult to prove anything except accidental coinci- 

 dences among the lines of the different elements. Accurate investiga- 

 tion generally reveals some slight difference of wave length or a com- 

 mon impurity. Furthermore, the strength of the lines in the solar 



