Phil .Mag 5.S.W SS 



hhie 



EM 1SSI ON 



greeny 



I) 



d 



ABSORPTION 

 violet, Tj1mj& green I) 



Fi o. 3 . Fig. 4. 



SPECTRA FROM HEATED SODIUM VAPOUR. 



JVctC'. The c<>ittiuiunM sj>e^(runi attlve. e/lges umi&sfi-cmth&ghnruujwalb 



Mintern. Bros . lith. . 



"exL 



