On the Spectra of Carbon Compounds. 



477 



{II.) The Oxycarbon Spectrum (Synonyms — the carbon mon- 

 oxide or carbonic oxide spectrum, carbonic acid spectrum). 

 Occurrence : 

 (i.) Carbon dioxide and carbon monoxide with the electric dis- 

 charge, 

 (ii.) Many oxygen compounds of carbon or other compounds of 



carbon when contaminated with oxygen and sparked, 

 (iii.) As accidental impurity in other spectra. 

 Reputed origin. — (i.) Carbon monoxide. 



