Introductory material

Number of Kepler’s published Works—His numerous Manuscripts in 22 folio volumes—Purchased by Hevelius, and afterwards by Hansch—Who publishes Kepler’s Life and Correspondence at the expense of Charles VI.—The History of the rest of his Manuscripts, which are deposited in the Library of the Academy of Sciences at St Petersburg—General Character of Kepler—His Candour in acknowledging his Errors—His Moral and Religious Character—His Astrological Writings and Opinions considered—His Character as an Astronomer and a Philosopher—The Splendour of his Discoveries—Account of his Method of Investigating Truth,