Paper, 'On the face of the Moon' and 'Of Saturn's ring' by Robert Boyle A discourse read at a meeting of the Royal Society containing Hooke's remarks on Dr Vossius' tract about the lunar surface, which Vossius considers like the surface of the earth comprising land and water. Also remarks on Monsieur Gallet's hypothesis on spots of moon and on the rings of saturn and Huygen's 'Astroscopia Compendiana'. Subject: Astronomy Read at a meeting of the Royal Society: 17 December 1684 17 December 1684