GASEOUS SPECTRA IN VACUUM TUBES. 131 
MARSH-GA S—continued. 
Colour. Subject of Observation. Intensity. Sop ais W.N. Place. Impurities. oneteuerts Lees 
Part 2—continued. 
Citron. Hazy line, . : - 5 5 15 | 46 534 2 a 
Haze intervenes, j , . i 
Stronger line, 0 : : ; 2°0 I 46 876 2 2 
Stronger line, : ; : 2°0 I 47 137 2 2 
Resolvable haze intervenes, ; 4 sine 
Line, . 4 : 15 | 47 636 Oxygen ? 
Resolvable haze inter venes, : ‘ nit 
Thin line, . : : 10 | 47 900 Hydrogen 
Resolvable haze intervenes, : 5 atts 
Hazy band, . ; 5 2°0 HI 48 263 Nitrogen ? 
Very black space follows. 
Green. Grand Green band begins sharp, . 5 } 48 838 Carbon 
Feat ‘ Be. Carbo- 
Faint view of Blow-pipe Green Giant, 1 49 181 Hydrogen 
Fainter end of Green-band, . ; Oda valli rcekee 49 410 
- ae 49 896 
Resolvable haze band, . : : sb 50 356 
45 9 te le A mat sae fe met Carbon ? 
Hazy line, 1:3 Hi 50 682 Hydrogen ? 
Hazy line, 1:0 = 50 839 
(SSS Hazy line, 4 : F 7, = 51 067 Nitrogen ? 
Fainter hazy line, . , : : : 1:0 “ 51 275 2 2 
Narrow band, 2 HH a oe Hydrogen 
Very faint hazy line, 0°5 : 51 726 Nitrogen ? 
Glaucous Hydrogen, 4 | 52 256 Hydrogen 
Parte 52 258 
Glaucous. Glaucous Hydrogen, . 4 | 52 260 
Begins sharply, 3 52 544 
Blue band } ieee faintly, . 0°8 it ; 53 112 Carbon 
; -Begins sharp, 10 53 803 2 2 
anand Ends weak, 0°3 co 53 993 
0'5 54 182 
Hazy lines, . : : : : 05 : 54 420 
0°5 ; 54 628 
—_——__——_ Stronger hazy line, 1:0 i: 54 787 Hydrogen 
'  Faintest hazy line, : 0°2 : 55 094 
Begins sharply, HED 55 326 ; 
Band eee weakly, . 0°5 aie 55 740 pane 
Bice. Faint haze, ‘ : 0:3 55 954 
3 Faint haze, 0°3 56 054 
| Strong haze band, begins, 2°5 56.200 | 
’ ends, 1:0 56 732 ya 
1°5 57 488 
Indigo. Haze bands, . : : : ; 1:0 57 897 eZ 
| 07 58 147 ? 
— A haze band begins, tenes ; 
Violet Hydrogen, _ ae Dee 
Violet Hydrogen, . 15 58 615 Hydrogen 
Part 5. ae elt 
‘ Violet Hydrogen, 2°5 a 58 512 . 
Faint li 58 997 Carbo- Carbo- 
Violet. Satie a 1 | Hydrogen Hydrogen 
Line beginning a faint band, . 20 59 474 . 
Ena of that band, . 0°3 59 700 WIRES 
Very black space follows, 0 
Leader of peculiar Marsh-gas series, 3 60 243 60 243 
Second, a hazy line, 20 60 534 60 534 
Third line, hazy, . 1°5 60 704 |, 60 704 
1:0 60 948 60 948 
0°8 61 161 61 161 
Remaining lines of ‘‘Marsh-gas |} 0°7 61 355 61 355 
Lavender. series” weaker, hazier and broader, |} 0°5 61 563 61 563 
: 0°3 61 865 61 865 
0-4 iH 62 139 62 139 
eh ee 
