260 Mr. G. A. Hemsalech : Excitation of Spectra of Carbon, 



spectrograph, would naturally tend to mask or obliterate 

 some of the lines. 



Also in this case it is impossible to form an adequate 

 opinion as to the true character of the spectrum emitted 

 by vanadium, on account of the absolute lack of information 

 with regard to its flame spectra. 



Carbon. 



Bed edge of band. 



\. Relative Intensity. 















#3861-71 



4 



1 









1 





#3871-39 



6 



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So-called 



#4167-61 



#4180-82 



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> Cyanogen 

 bands. 



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3 



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4697-39 

 4715-13 



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IV. 





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Swan 

 Spectrum. 



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III. 





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The spectrum is composed of the so-called cyanogen bands 

 and three groups of the Swan bands. I have no doubt that 

 group I. of the last-named bands — namely, that with head 

 at \ 6188, would likewise show were it not for the presence, 

 in this part of the spectrum, of one of the hazy broad red 

 bands. A higher dispersion will probably reveal it. The 

 bands at 3883 and 4216 are particularly intense and, 

 next to the hazy red bands, they constitute the most pro- 

 minent feature of the red fringe spectrum ; also I feel 

 inclined to attribute the violet tint in the red coloration of 

 the fringe to the presence of these bands. 



Although there is nothing noteworthy in the general 

 aspect of the carbon bands as excited by the therm- 

 electronic current, it is however of prime importance to 

 point out the marked fundamental difference which dis- 

 tinguishes this mode of their excitation from that which 

 determines the emission of these bands in the explosion 



