I have divers times, upon discerning my Quicksilver to fall without any visible cause at home, looked abroad; and found (by the appearance of broken Clouds, or otherwise) that it had rained not far off, though not with us: Whereupon, the Air being then lightened, our heavier Air (where it rained not) may have, in part, discharged it self on that lighter. * * * * * _A more particular Account of those Observations about _Jupiter_, that were mentioned in _Numb. 8_._ Since the publishing of _Numb._ 8. of these _Transactions_, where, among other particulars, some short Observations were set down touching both the _shadow_ of one of _Jupiter's Satellits_, passing over his Body, and that _Permanent Spot_, which manifests the Conversion of that Planet about his own _Axis_; there is come to hand an _Extract_ of that Letter, which was written from _Rome_, about those Discoveries, containing an ample and particular Relation of them, as they were made by the Learned _Cassini_, Professor of _Astronomy_ in the University of _Bononia_. That _Extract_, as it is found in the _French Journal des Scavans_ of _Febr._ 22. 1666. we thus _English_. Monsieur _Cassini_, after he had discovered (by the means of those Excellent Glasses of 50. _palmes_, or 35. _feet_, made by M. _Campani_) the _Shadows_, cast by the 4 Moons or _Satellits_ of _Jupiter_ upon his Diske, when they happen to be between the Sun and Him; after he had also distinguished their Bodies _upon_ the Diske of _Jupiter_; made the last year some Praedictions for the Months of _August_ and _September_, noting the dayes and hours, when the Bodies of the said _satellits_ and their _Shadows_ should appear upon _Jupiter_, to the end that the Curious might be convinced of this matter by their own Observations.