Letter, from Henry Oldenburg to Robert Boyle Lists fossils found in Liege; that Dr Needham's letter suggests many good experiments and wants to invite him to the Society; that Boyle's experiments on respiration would be of interest to the Society; that Boyle's experiments on light in shining wood and fish have been featured in the French philosophical journal; Cassini's account of the comet (in Latin); that a stone, over four pounds in weight, had been taken from of a horse 14 April 1668