ON WAVE-LENGTH TABLES OF THE SPECTRA OF THE ELEMENTS. 257 



Calcium Chloride and Oxide. 

 Eder and Valenta : ' Sitzber. kais. Akad. Wien,' Bk. Lx. 1893. 



In the arc spectrum Kavser and Runge obtaia for trie line 4227, due to metallic 

 calciuna, the number 422691 (2.5650^4.) 

 * Due to calcium chloride. 

 f Due to calcium oxide. 

 1894. 8 



