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Sun, etc., 4A; London and Edinburgh, 1863.
˜
[5] PeriodicitAt der Sonnenflecken. As-
tron. Nach. XXI. , 1844, P. 234.
[6] R.S. Phil. Trans. (ser. A), 1906, p.
69-100.
[7] ”Researches on Solar Physics,” by De
la Rue, Stewart and Loewy; R. S. Phil.
Trans ., 1869, 1870.
[8] ”The Sun as Photographed on the K
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