140 PROFESSOR PIAZZI SMYTH ON 
OXYGEN. Enp-on TusE—continued. 
Colour. Subject of Observation. Intensity. ba W.N. Place. || Impurities. Pe paecnd be Onyaenie 
Part 3—continued. 
Another sharp brilliant line, . : 4 47 676 47 659 . 
Ultra faint haze band, . . «| 0-8 ‘: ae ace 
Very thin faint line, . ; A 01 | 48 710 
Green. Sharp beginning of Green band, , 5 Bee 48 840 Carbon 
Thin line in that band, . : 7 1 l 49 360 
Hydrogen ? 
Part 4. 49 365 
The thin line last alluded to, c 1 1 49 370 
Faint, semi-resolvable haze, . b 0°5 | eH ee Hydrogen ? 
: 50 588 Carbon ? 
Faint but hard edged band, . : 0°5 HI (| BO 858 He aes, cert 
Faint line, . . . 5 5 1 1 51 120 
Fainter haze intervenes, : 0°3 es : 
Faint line, . 5 5 . . 1 1 51 490 Hydrogen 
= aes Hydrogen, excessively 9 a 52 246 Hydrogen 
aucous, : : % E 7 2 
: Glaucous Hydrogen, repeated after “ 
improving focus, i HOP, 9 BM | 52 250 Hydrogen 
Blue band, . i ; 5 ‘ 3 52 514 Carbon 
Faint hazy line, in fainter haze, 1 54 020 Carbon ? 
Do. do. 07 54 286 
—_— Do. do. 07 54 820 
End of broad faint haze, 0°3 55 990 
Blue. 
Sharp beginning of faint band, 15 Hh, 56 286 Carbon 
—-—-— Sharp beginning of flat band, 5 05 57 804 Carbon 
Indigo. Strong line ends it. (Ox.) . 2 58 160 58 156 
Violet Hydrogen, . C . 3 I 58 525 Hydrogen 
Violet. | Part 5. Tks 
Violet Hydrogen, . : . 0 3 I 58 540 Hydrogen 
Beginning of faint haze, ; ; 0°3 s 58 930 Carbon ? 
End of same, ; : 5 ; 01 4 61 160 
; 3 61 658 
Lavender. Gray band =: ’ ; ; ; we +E 61 840 
Gray line, . , : ; ; 1:0 i 61 904 Hydrogen 
End of Spectrum. 
No Nitrogen appears here. 
as ne Carbon and Hydrogen impurity, as well as the proper Oxygen ; the latter too in far greater force than in any 
other tube. 
The two first red lines re-observed on April 7th as 8% 568 and 36 134. 
Of the other and stronger Oxygen lines, two certainly, and probably four, are very close, exceedingly close and beautifully 
sharp, doubles; of which I hope to give a further account on a future occasion, after completing some wrangements now in 
progress for increasing both the dispersion and the magnifying power of my present spectroscope. 
