Minutes of an ordinary meeting of the Royal Society Mr Evelyn asked to prepare oyl of Sulphur of the tryall of the Experiment of its weight & Bulk. Dr Petty bring in the Experiment of the Coppelle in writing. Dr Merritt to bring in an Appendix to his papers of Refining, about Cementation & the Antimony horne. That Dr Whistler, Mr Povey, Mr Hill bring in their Snake-stones. 20 February 1661