Copy letter from Martin Lister, York, to Henry Oldenburg ' Some observations about the Astroites ' ' which are stones also ionted like the others, but not found that i know of, in the same Rockes. And we must crosse the plain contrey, and seeke for them hard under the York-shire wooldes : For what store I could procure of them, were brought me from Bugthorpe and Leppington. ...' Also includes a full page of ink drawn figures, and provides an explanation for them 19 January 1673/1674