The Rev. S. J. Perry’s observations.
The Rev. S. J. Perry observed at Stonyhurst four lines, and, on examining one of the curved streamers, found the red line even more strongly marked than the green. A magnetic storm was observed to be at its height from 4 to 9 P.M. of the same day.
J. R. Capron’s observations.
With a Browning 7-prism direct-vision spectroscope I saw the green line in all parts of the Aurora, attended with a peculiar flickering movement. I did not see the other lines.
His catalogue of lines up to Nov. 9, 1872.
In a letter to ‘Nature,’ dated November 9th, 1872, I catalogued the lines observed up to that date as follows:—
1. A line in the red between C and D. W.L., Ångström, 6279.
2. A line (the principal one of the Aurora) in the yellow-green, between D and E. W.L., Ångström, 5567.
3. A line in the green, near E (corona line?). W.L., Alvan Clarke, jun., and Backhouse, 5320.
4. A faint line in the green, at or near b. W.L., Barker, 5170.