Letter, from Francis Vernon to Henry Oldenburg, dated at Paris Concerning work on the doctrine of motion (sends a parcel containing 12 propositions and demonstrations) and on parhelia (mock suns); concerning Cassini's work on the ephemerides; mentioning experiments on pendulums; mentioning Picard's work and that Justel was sending a paper about seeds from Quintinies Read to the Royal Society on 24 February 1670 1670