Note 52 — PART I. PHYSICAL CONSTITUTION OF COMETS.

Harmonices Mundi, (Tab. IV. Cap. VII). This work Kepler published in 1619, and dedicated to James VI. of Scotland. Another treatise of his appeared in the same year, entitled, Prognosticon, &c. or the Prediction of Misfortunes for Governments and Churches, principally from the Comet and the Earthquake in 1618 and 1619. This, however, is the individual whom Halley describes as “Astronome d’un sagacité extrême, et d’un génie presque divin.”—(Delambre, Hist. d’Astr. Halley.)