EFFECT OF PRESSURE UPON ARC SPECTRA. GOLD. 



53 



The lines in the Table were measured by comparison with the spectrum from an 

 iron arc photographed upon the same plate, and their identification with the lines 

 measured by KAYSER and RUNGE and EDER and VALENTA was thus rendered simple. 

 The wave-lengths are those given in the two above-mentioned papers. 



The letters in the first column of the Table, ol, a2, 61, 62, cl, c2, &c., have been 

 added to facilitate reference to the lines to which they refer. 



TABLE I. 



* E. & V. = EDER and VALENTA, 'Denkschr. K. Akad. Wiss. Wien,' LXVIII., 1899. 



t E. & H. = EXNER and HASCHKK, 'Sitzber. K. Akad. Wiss. Wien,' CVIL, 1898. 



} H. W. MORSE, ' Astrophys. Journ.,' 21, p. 226. 



K. & R. = KAYSER and RUNGE, ' Uber die Spectren der Elemente,' V., 1892. 



|| H. & K. = HACENBACH and KOXEN, 'Atlas of Emission Spectra.' 



11 L. DE B. = LECOQ DE BOISBAUDRAN, 'Spectres Lumineux,' Paris, 1874. 



