[17] In these observations some suggestions made by Mr. Capron have been incorporated.
[This was Mr. Lockyer’s note. In point of fact, the Author was responsible for the verbatim paragraphs comprised between the letters A and B, and C and D, in the instructions as now reprinted.]
[18] Communicated by the author to the Royal Saxon Academy of Science, 1871.
[19] Reports of the Royal Saxon Academy of Science, Oct. 31, 1871.
[20] This red line was first noticed by Zöllner.
[21] Recherches sur le Spectre Solaire, p. 42.
[22] American Journal of Science, lxviii. 123.