256 KEPORT — 1894. 



Potassium. 

 Eder and Valenta : • Sitzber. kais. Akad. Wien,' Bd. Ix. 1893. 



Note.— 'J'he continuous spectrum due to potassium extends from 6400 to 4000, 

 being most intense between 5700 and 4700. According to Vogel (' Spectral Analyse ') 

 it is due to potassium oxide, but it is present in the spark spectrum of metallic 

 potassium in an atmosphere of hydrogen. The lines 4045-8, 3447-2 and 3217-5 occur 

 • *i, . *!, /. ui V 4047-4 1 3447-5 \ „„, 3217-8 \ 



an the arc spectrum as the double lines 4944-3 1 3446-4 1 3^17-3 I ' 



Sodium. 



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



The line 3302-5 appears in the arc spectrum as the double line -j'-^oo-a- f > ^^^^ 

 the line 28530 as 2852-91.— Kayser and Kunge. 



Lithium. 

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



* In the arc spectrum Kavser and Eunge obtain for these lines the numbers 

 4602-37 (21721-8) and 3232-77 (30923-7). 



