IN CONNEXION WITH THE SPECTRUM OE THE SUN. 
275 
Platu XIII. Strip V.— BARIUM. 
Whether re- 
Whether in 
Wave-length. 
Length. 
versed in the 
Solar Spec- 
the Spark- 
Spectrum of 
Remarks. 
trum. 
the Chloride. 
6526-0 
1 
Not reversed. 
Not present. 
6496-0 
4 
Reversed. 
33 
6483-0 
3 
33 
33 
Accidentally omitted from solar strip in the Map 
and made too short. 
6449-0 
1 
9 
33 
Coincident with a reversed calcium line. 
6343-0 
1 
9 
33 
There is a line at 6343-2 in Angstrom's map, but 
6140-6 
4 
Reversed. 
33 
this is too short for reversal. 
6109-9 
3 ' 
33 
33 
6062-0 
1 
Not reversed. 
33 
6018-0 
1 
33 
33 
5991-5 
1 
33 
33 
5971-0 
1 
3) 
5904-5 
1 
9 
Coincident with a faint iron line. 
5852-5 
4 
Reversed. 
33 
5827-0 
1 
Not reversed. 
3> 
5808-5 
5803-5 
; 1 
9 
33 
Coincident with two iron lines reversed in the sun. 
5779-5 
3 
Reversed. 
33 
5534-5 
4 
3 3 
Present. 
This appears to he the longest Ba line. 
5521-5 
3 
33 
Not present. 
5425-0 
3 
Not reversed. 
33 
This line behaves in a very curious manner ; it is so 
nearly of the same height as the one next less re- 
frangible, that it sometimes appears longer and some- 
times shorter as the spark flashes, and yet it is not 
O 
given in Angstrom’s solar spectrum ; it is given 
reversed in Kjrchhopp’s solar map, its number being 
1371-3. 
4933-4 
4 
Reversed. 
Present. 
Winged and very brilliant, reverses itself in the 
spark when the metal is used. 
4899-3 
4 
33 
Not present. 
Slightly shorter than the preceding one, and 
winged, but to a less extent. 
4553-4 
4 
33 
Present. 
Winged. 
4524-4 
4 
33 
Not present. 
Winged, and slightly shorter than the preceding 
line. 
4165-5 
3 
Not reversed. 
Winged. 
4130-5 
3 
33 
33 
33 
Tiialen’s lines were taken from the spectrum of Ba Cl 2 ; with a high tension spark 
the metal shows many more lines. The spectrum requires further investigation. 
