132 
Colour. 
Lavender. 
Gray. 
PROFESSOR PIAZZI SMYTH ON 
MARSH-GA S—continued. 
Subject of Observation. 
Part 5—continued. 
Solitary hazy line, 
Very faint haze band, 
Faint but sharp beginning of a band, 
looking eEprony? like 
tion, . 4 
End of Spectrum. 
Intensity. ae W.N. Place. 
5 | M0) I 62 548 
OB | owe 63 791 
65 610 
a 
e a reflec- 
Impurities. 
Constituents 
dissociated. 
Carbon ? 
Unclaimed for 
Marsh-Gas. 
62 548 
63 791 
65 610 
The beautiful violet series of lines and bands, beginning at 60 248, and continuing to 62 000 nearly, in decreasing 
intensity was discovered by Prof. A. S, HprscuEn in these End-on tubes in 1879, and confirmed therein by myself ; with 
the result of finding traces of them in some other hydro-carbons, as Alcohol ; but always far weaker than in Marsh-Gas. 
In hardly any Hydro-Carbon is there so little of the Marsh-Gas series to be seen as in Olefiant Gas; and yet that is so 
near in chemical constitution to Marsh-Gas, which has the series so splendidly, that it must belong to that gas; and it is 
certainly the spectrum of a compound, and not an elemental, gas, because it vanishes with ereater intensity of spark and 
dissociating power. 
Colour. 
Crimson- 
Red. 
Red. 
ae let-Red. 
| 
Light-Red. 
Orange. 
Yellow. 
NITROGEN. 
Subject of Observation. 
Part 1. 
Very faint hazy mee 
Hazy line, 
Haze band, 
Haze band, 
Do. do. 
Do. do. 
Do. do. 
Dowco, . 
Red Hydrogen, 
Part 2) 
Red Hydrogen, 
Faint band, 
Hazy band, 
do. 
do. 
do. 
Hazy line, 
Do. do. 
The Oxygen line, . 
Faint hazy band, 
Hazy band line in haze, 
Do. do. 
ENp-oN TUBE. 
Symbol=N. 
Intensity. spear ‘ 
OM HE HOOCOHO 
SAANMSON 
W.N. Place. 
Impurities. 
Oxygen 
| Hydrogen 
| 
Hydrogen 
Hydrogen ? 
Hydrogen ? 
Oxygen 
Carbon and 
Nitrogen 
Observed July 16, 1879. 
Constituents 
dissociated. 
Unclaimed 
features left 
for Nitrogen. 
33 975 
34 973 
36 189 
37 075 
37 555 
37 996 | 
38 430 | 
38 988 
39 260 
39 588 
39 692 
40 024 
40 150 
40 514 
40 628 
40 930 
41 460 
41 736 
41 818 
42 005 
42 120 
42 320 
