106 PROFESSOR PIAZZI SMYTH ON 
AIR. Enp-on Gas Vacuum TvuBE. 
Observed Sept. 26 and 27, 1879. 
A Mixture of N + O + Watery Vapour, &c. 
Colour. Subject of Observation. 
Crimson- 
Part 1. 
Red. Faint line, 
Red. Very faint band, 
Faint band, 
Scarlet-Red. Band, 
Band, 
Red hydrogen, 
Part 2. 
Red hydrogen, 
Band, 
Light-Red. Bright band, faint cleft Hels 
middle, . ; - 
Do. do, ons ; 
——__ —— Do. do. do. . 
Orange. Narrower band, 
Distinct line, with black line or 
space on either side, . : : 
Unequal double line, . - 
Close band of lines, 
Strong beginning of narrow band, . 
Strong line beginning a graduated 
band, : c - : 
End of that band, 
Bright hazy line, . 
Space intervenes full of lines, 
Strong ending line of above, . : 
New band of many thin lines begins, 
Strong ending line to that band, 
——_—— Thin line follows, 
Yellow. Band ; begins faintly, 
culminates in ’strength, 
ends faintly, 
A notable black line follows. 
Part 3. 
Band begins after a black line, 
Strong bright line ends band, 
Bright line perhaps double, 
Band of close lines, 
Citron. Hazy line, . 
Thick bright line, . : 
After this a notable broad dark 
space, 
Line 
Faint features in the dark ) Line 
space, . - 5 Line 
Band 
A band begins a brighter green 
region, ? . : 
A fainter band, . P 
Do. do. a ° ° 
Intensity. 
an ncsd ad 
RK WrHONHNDE DFE bd me bo 
or 
Nore 
15 
Appear- 
ance. 
W.N. Place. 
{ 
Impurities. 
Hydrogen 
Hydrogen 
Carbon 
| 
| 
| 
| 
Hydrogen 
2 
Hydrogen 
2 
Hydrogen 
New 
Hydrogen 
Hydrogen 
Hydrogen 
Hydrogen 
Hydrogen 
Carbon 
Constituents 
dissociated. 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Oxygen ? 
Oxygen ? 
Oxygen 
Nitrogen 
Nitrogen ? 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen ? 
Nitrogen ? 
Nitrogen 
Nitrogen 
Nitrogen 
Nitrogen 
Unclaimed 
for Air. 
None; and no 
solar telluric 
lines appear. 
