304 
Waye-length. Intensity. 
7065°5 5) 
6678°1 8 
5876°0 30 
59062°15 383 
5047°1 5 
5015°9 < 
4931°9 3 
4922°6 10 
4870°6 7 
4847°3 7 
4805°6 9 
4764°4 2 
4735°1 10 
4713-4 9 
4658'5 8 
4579°1 3 
4559°4 2 
4544°1 5 
4520°9 3 
4511°4 a) 
4497°8 2 
W. Crookes—Spectrum of Helium. 
A red line, seen in all the samples of gas, Young 
gives a chromospheric line at 7065°5. 
A red line, seen in all the samples of gas. Thalén 
gives a line at 6677 and Lockyer at 6678. 
Young gives a chromospheric line at 6678°3. 
The characteristic yellow line of helium, seen in 
all the samples of gas. Thalén makes it 5875°9, 
and Rowland 587598. Young gives a chromo- 
spheric line at 5876. 
A yellow-green line, only seen in “helium 
puriss.” and in “ bréggerite, R,? and “1.” 
Thalén gives the wave-length as 5048. 
A green line seen in all the samples of gas. 
Thalén gives the wave-length 5016. Young 
gives a chromospheric line at 5015°9. 
A green line, seen in all the samples of gas. 
Thalén gives the wave-length 4922. Young 
gives a chromospheric line at 4922°3. 
A green line, only seen in “uraninite, Rh.” 
Young gives a chromospheric line at 487074. 
A green line, only seen in “uraninite, R 
Young gives a chromospheric line at 4848-7. 
A green line, only seen in “uraninite, R.” 
Young gives a chromospheric line at 480525. 
There is a hydrogen line at 4764°0. 
A very strong greenish blue line, only seen in 
* uraninite, R.” 
A blue line, seen in all the samples of gas. 
Thalén’s measurement is 4713°5. Young gives 
a chromospheric line at 4713°4 
A blue line, only seen in “ uraninite, R.” 
A faint blue line, seen in “ uraninite, R.” Lock- 
yer gives a line at 4580, from certain minerals. 
I can see no traces of it in the gas from broég- 
gerite. A hydrogen line occurs at 4580°1. 
Young gives a chromospheric line at 4558°9. 
29 
A faint blue line, seen in “ uraninite, R.” Lock- 
yer gives a line at 4522, seen in the gas from 
some minerals. Young gives a chromospheric 
line at 4522°9, It is absent in the gas from 
bréggerite. 
A blue line, seen in ‘‘uraninite, R,’ but not in 
the others. It is coincident with the strong 
head of a carbon band in the CO, and Cy spec- 
trum. 
There is a hydrogen line at 4498°75. 
