GENERAL DISCUSSION OF SPECTROSCOPIC RESULTS. 
4G9 
Abnormal Cr Lines. 
In sun. 
In flash. 
If 
enhanced. 
j 
i 
i Eeniarks. 
1 
Wave4ength. 
Intensity. 
Waveflength. 
Intensity. 
Li 
1 
nes strong in flash. 
359.3-04 
9 
3593 - 65 
30 
1 
4242-54 
2 
4242-6 
1 
Yes 
4359-78 
3 
4358 - 9 to 
) 5^ 
N(-) 
r The Cr line is confused with other 
4360-2 
J 
\ lines in flash. 
4539-95 
0 
4539-8 
0 
No 
4541-69 
2 
4541-6 
1 
No 
4558-S2 
3 
4558-8 
8 
Yes 
4588 - .38 
3 
4588-0 
2 
Yes 
4GGG-39 3 
0 
4666-5 
5 
No 
-G6 J 
1 
4708-20 
2 
4708-1 
1 
No 
Lines weak or absent in flash 
intensity exceeding 3 in O. 
4G2G-3G 
5 
Absent 
No 
r Present in Frost’s and Mitchell’s 
\ lists. 
4651-46 
4 
4651-3 
21 
No 
1 c. 
4G52-34 
5 
Absent 
No 
> bpectruin very weak here. 
1 hese sources of error would all tend to produce discordances in the relative 
intensities between the dark lines of an element and their laight reversals in the 
tlasli, and the question arises whether tlie apparent anomalies which are indicated 
above are to l)e ascribed to sncli imperfections in onr knowledge of tlie spectra, or to 
fundamental differences such as )night he ex])ected were the emission and aljsorption 
spectra ])roduced in separate and distinct layers of tlie sun’s atmosphere, and under 
different conditions of temperature and pressure. 
Under tlie heading “Abnormal lines” I give witli eacli table a list of the lines 
witli intensities in tlie flasli considerably above the average, corresponding with the 
dark line intensity, and a list also of tlie exceptionally weak or alisent lines. 
In these lists the wavedengths and intensities of the solar lines, Irom Eowland, 
are entered in the first two columns, followed by the wave-lengths and intensities 
taken from lable L in columns 3 and 4. The fifth column Indicates whether the line 
IS an “enhanced” line or not, i.e., a line which is relatively brighter in the spark 
than in the arc spectrum of the element as determined by Lockyer. 
It IS at once apparent tliat many of the abnormally bright flash lines are enhanced 
lines, whilst none of the abnormally weak lines are enhanced lines. Tlie lists of 
enhanced lines published by Sir Norman Lockyer do not include the ultra-violet 
region beyond \ 3800, it is uncertain, therefore, whether the flash lines in this reo-ion 
