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. [Sidenote: 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. [Sidenote: 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. 5. A faint line or band in the green, between _b_ and F. W.L., Barker, 5020 (chromospheric?). 6. A line in the green-blue, at or near F. W.L., Alvan Clarke, jun., 4850. 7. A line in the indigo, at or near G. W.L., Alvan Clarke, jun., 4350. 8. The continuous spectrum from about D to beyond F. [Sidenote: Dr. H.C. Vogel’s observations of Auroral lines. Spectrum described.] Dr. H. C. Vogel, formerly of the Bothkamp Observatory, near Kiel, and since of the Astrophysical Observatory, Potsdam, made several observations of the Auroral lines, October 25th, 1870. Besides the bright line between D and E, he found several other fainter lines stretching towards the blue end of the spectrum on a dimly-lighted ground. February 11th, 1871, he observed the same set of lines, and an average of six readings gave 5572 as the W.L. of the Ångström line. February 12th gave 5576 as Dr. Vogel’s reading, and 5569 as Dr. Lohse’s. April 9th gave 5569, and April 14th 5569. The Aurora of April 9th, 1871, was exceedingly brilliant, so that micrometer measurements of the lines were taken. The spectrum consisted of one line in the red, five in the green, and a somewhat indistinct broad line or band in the blue. The lines are thus described:— [Sidenote: Table of lines.] Table of Dr. Vogel’s lines. Aurora, April 9th, 1871.