53; Grant, History of Physical Astronomy, p.

305, etc., etc.

For a curious partial anticipation by Hooke, in 1664, of the great truth announced by Halley in 1682, see Pepy's Diary for March 1, 1664.

For excellent summaries of the whole work of Halley and Clairaut and their forerunners and associates, see Pingre, Madler, Wolf, Arago, et al.
(122) In accordance with Halley's prophecy, the comet of 1682 has returned in 1759 and 1835.

See Madler, Guillemin, Watson, Grant, Delambre, Proctor, article Astronomy in Encycl.Brit., and especially for details, Wolf, pp.