[2] R. S. Phil. Trans., 1774.
[3] Ibid, 1783.
[4] Observations on the Spots on the Sun, etc., 4°; London and Edinburgh, 1863.
[5] Periodicität der Sonnenflecken. Astron. 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 line”; Knowledge, London, 1903, p. 229.
[9] R. S. Proc., xv., 1867, p. 256.
[10] Acad. des Sc., Paris; C. R., lxvii., 1868, p. 121.