Dictionary of National Biography, 1885-1900/Colson, Lancelot
COLSON, LANCELOT (fl. 1668), was an astrologer who practised at the sign of the Royal Oak on Great Tower Hill. His almanack or ephemeris was published there from 1660 to 1676, together with his 'Philosophia Maturata, an Exact Piece of Philosophy, containing the practick and operative part thereof in gaining the philosopher's stone,' &c. (London, 1668, 12mo). This volume is one of the leading works on the philosopher's stone.
[Colson's Ephemerides.]