[191] Nichol's Contemplations on the Solar System, xxx.
[192] Cosmos III. 253.
[193] Herschel's Outlines of Astronomy, chap. xvi.
[194] New York Evangelist, May 5, 1870.
[195] Nichol's Architecture of the Heavens, 9th edition, 272.
[196] Pontecoulant in System of the World, p. 70.
[197] Progress of Astronomy, 70.
[198] Memoirs of the French Academy, by M. Le Verrier; from The Annual of Scientific Discovery, for 1855, p. 376.
[199] Herschel's Outlines of Astronomy, p. 558, ed. of 1853.
[200] Illustrations of Universal Progress, page 298.