Part 10 (1/2)

[Footnote 208: _Ibid._, p. 218. In a letter to Von Zach of June 24, 1802, he speaks of Pallas as ”almost incredibly small,” and makes it only seventy English miles in diameter. _Monat. Corr._, vol. vi., pp.

89, 90.]

[Footnote 209: Olbers, _Monat. Corr._, vol. vi., p. 88.]

[Footnote 210: _Conn. d. Tems_ for 1814, p. 218.]

[Footnote 211: _Popular Astronomy_, p. 327.]

[Footnote 212: _Month. Not._, vol. vii., p. 299; vol. viii., p. 1.]

[Footnote 213: _Ibid._, p. 146.]

[Footnote 214: Airy, _Mem. R. A. S._, vol. xvi., p. 386.]

[Footnote 215: See Newcomb's _Pop. Astr._, p. 359. The error of Ura.n.u.s amounted, in 1844, to 2'; but even the tailor of Breslau, whose extraordinary powers of vision Humboldt commemorates (_Kosmos_, Bd. ii., p. 112), could only see Jupiter's first satellite at its greatest elongation, 2' 15”. He might, however, possibly have distinguished two objects of _equal_ l.u.s.tre at a lesser interval.]

[Footnote 216: J. W. L. Glaisher, _Observatory_, vol. xv., p. 177.]

[Footnote 217: _Mem. R. A. S._, vol. xvi., p. 399.]

[Footnote 218: For an account of D'Arrest's share in the detection see _Copernicus_, vol. ii., pp. 63, 96.]

[Footnote 219: _Mem. R. A. S._, vol. xvi., p. 412.]

[Footnote 220: He had recorded the places of 3,150 stars (three of which were different positions of the planet), and was preparing to map them, when, October 1, news of the discovery arrived from Berlin. Prof.

Challis's _Report_, quoted in Obituary Notice, _Month. Not._, Feb., 1883, p. 170.]

[Footnote 221: See Airy in _Mem. R. A. S._, vol. xvi., p. 411.]

[Footnote 222: He died January 21, 1892, in his 71st year.]

[Footnote 223: Ledger, _The Sun, its Planets and their Satellites_, p.

414.]

[Footnote 224: Presented by the Misses La.s.sell, after their father's death, to the Greenwich Observatory.]

[Footnote 225: _Astr. Jour._, No. 508.]

[Footnote 226: _Report of U.S. Naval Observatory for 1900_, p. 15.]

[Footnote 227: Grant, _Hist. of Astr._, p. 271.]

[Footnote 228: _Month. Not._, vol. ix., p. 91.]

[Footnote 229: _Month. Not._, vol. xi., p. 21.]

[Footnote 230: _Astr. Nach._, No. 756 (May 2, 1851).]

[Footnote 231: _Phil. Trans._, vol. i., p. 246. See H. T. Vivian, _Engl.

Mech._, April 20, 1894.]