GASEOUS SPECTRA IN VACUUM TUBES. 
AIR. Enp-on Gas Vacuum TuBE—continued. 
Colour. 
Citron. 
Green. 
Glaucous. 
Violet. 
Lavender. 
Subject of Observation. 
Part 3—continued. 
Hazy line, beginning of many such, 
Stronger hazy line, : : 
Do. do. 
Do. do. 
Do. do. 
Do. do. 
Do. do. 
Do. dower: 
Thicker hazy line, 
Dark space intervenes. 
Thick hazy line, 
Band, 
Very faint hazy lines, 
Strong hazy line begins a band, 
Second line therein, : ‘ 
Said band slowly fades out, 
Line in region of faint haze, . 
Fainter do. do. 
Do. do. do. 
Strong line begins a band, 
Said band ends weakly, 
Faint hazy line, 5 
Another like it, 
Glaucous hydrogen, 
Part 4, 
Beginning of a faint band, 2 
Strong beginning of another band, . 
Tail of above band ends, ; 
Strong beginning of another band, . 
Tail of band ends here, . - s 
Hazy line, . ; ; : : 
Strong beginning of another band, . 
Tail of band ends here, . : ; 
Strong beginning of another band, . 
Tail ends hereabouts, . ; : 
Strong beginning of another band, . 
Tail ends here, : : 
Another band begins strongly, 
Tail ends here, P ; 
Violet hydrogen, 
Part 5. 
Strong beginning of band, 
Tail of band, . : , 
Beginning of another band, 
Tail of that band, . 
Faint hazy line, 
Strong beginning of another band, . 
Tail thereof . : é ¢ 
Strong but hazy beginning of 
another band, . : ; : 
Tail thereof, . F ; 3 
Hazy beginning of another band, . 
A hazy band, ; : : 
Very faint band, . 
Doubtful band, 
Intensity. 
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NROSWS TWH AX 
SCNONONHONSOHO 
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Appear- 
ance. 4 
songs 
W.N. Place. 
46 358 
46 551 
46 706 
46 878 
47 006 
47 176 
47 298 
47 420 
47 582 
47 845 
48 129 
48 312 
48 433 
48 554 
48 677 
48 759 
48 900 
49 041 
49 478 
50 121 
50 481 
50 668 
51 071 
51 297 
51 526 
51 710 
52 243 
52 594 
52 812 
53 235 
53 877 
54 284 
54 507 
54 678 
55 046 
55 613 
56 178 
56 707 
57 248 
57 695 
58 211 
58 537 
58 725 
59 005 
59 667 
60 020 
60 388 
60 625 
61 026 
61 364 
61 811 
62 092 
62 754 
63 734 
64 465 
Impurities. 
Hydrogen 
Carbon 
} Carbon ? 
Hydrogen 
Hydrogen ? 
2 
Hydrogen 
Carbon 
Carbon ? 
Constituents 
dissociated. 
Nitrogen ? 
Nitrogen ? 
Oxygen ? 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Oxygen 
Nitrogen 
Nitrogen ? 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen ? 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
(No Oxygen 
visible here 
at 58 156.) 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
107 
Unclaimed 
for Air. 
In the Air-tube no change is perceptible over all the above Part 5 range (or known anywhere else) on changing the poles. 
No line comes in, such as M. de BoisBaupray’s strong a line in his open-air spark near the Negative Pole. 
The impurities traced here are Hydrogen (strongly, though in few lines only) and Carbon (weakly) ; the constituents are 
Oxygen not very brightly ; but Nitrogen overpoweringly in the number and often the strength of its bands. 
Nothing of importance left for Air as a compound. No Telluric lines, as in the Solar spectrum, are indicated. 
