First published in 1968. This is an exact facsimile reproduction of the posthumous 1698 edition of Christian Huygen's The Celestial Worlds Discover'd, except that an index, prepared by the General Editor, has been added.

First published in 1968. A reissue of the posthumous 1698 edition of Christian Huygen's The Celestial Worlds Discover'd or Conjecture concerning the Inhabitants, Plants and Productions of the Worlds in the Plants, including original figures and diagrams, with an index from 1968.