﻿the u Sican" Spectrum. 



583 



Group c 



5165-2 

 5129-4 

 510 J -0 



50S1-U 



f 473 72 

 ! 4715-3 



Group e H 46976 



! 4684-0 



: 4077-0 



and .a group /of somewhat different structure, viz., a bund 

 fading both ways, a sharply defined detached line, and a band 

 fading away towards the blue : — 



r 



Group / 



I 



4381-9 



to 

 4356-9 j 



433-1 -4 



431.5-0) 



to ' 



4234-0 J 



band. 



detached line." 



band. 



The same bands are 

 gases at atmospheric 

 eras. 



obtained by taking the spark in certain 



pressure, viz., carbonic oxide, oleflant 



cyanogen. In this last gas (and in the others if air is 



present) we observe besides the groups given above, certain 

 bands no doubt due to cyanogen (or at least dependent upon 

 the presence of nitrogen). These are : — 



f 4600 



Group 



Group d 



I 



4574 

 4550 

 4532 

 4515 

 4505 

 4500 



4210-1 

 4197-2 



41-1-5 

 4177-7 

 4165-4 

 4158-2 



We have experimented with the following liquids, in each 

 ease of as great purity as we could procure : — Chloroform, 

 benzene, naphthalene, aniline, ethylene dibromide, ethyl 

 bromide. In most cases the liquid proved highly insulating 

 and only a minute spark could be obtained, only a fraction 

 of a millimetre in length. In all these liquids carbon is 



2Q2 



