To which are Annext New Experiments to Make Fire and Flame Ponderable. Together with A Discovery of the Perviousness of Glass. Also An Essay, about the Origine and Virtue of Gems. By the Honourable Robert Boyle, Fellow of the Royal Society. To which is Added The Prodromus to a Dissertation Concerning Solids Naturally Contained Within Solids Giving an Account of the Earth, and Its Productions. By Nicholas Steno. Englished by H.O.