In the above-mentioned _French_ Tract there is also conteined M. _Auzout's_ Opinion of what he had found New in the _Treatise_ of Signor _Campani_, which was spoken of in the first _Papers_ of these _Transactions_, concerning both the Effect of the _Telescopes_, contrived after a peculiar way by the said _Campani_ at _Rome_, and {71} his New Observations of _Saturn_ and _Jupiter_, made by means thereof. First therefore, after that M _Auzout_ had raised some scruple against the Contrivance of Signor _Campani_ for making _Great Optick-Glasses_ without _Moulds_, by the means of a _Turn-lath_, he examines the _Observations_, made with such _Glasses_: Where, having commended _Campani_'s sincerity in relating what he thought to have seen in _Saturn_, without accomodating it to M. _Hugens_'s _Hypothesis_, he affirms, that supposing, there be a _Ring_ about _Saturn_, Signor _Campani_ could not see in all those different times, that he observed it, _the same Appearances_, which he notes to have _actually_ seen. For, having seen it sometimes in _Trine Aspect_ with the _Sun_, and _Oriental_; sometimes, in the same _Aspect_, but _Occidental_; sometimes in _Sextil Aspect_, and _Occidental_; at another time, again in _Trine_, and _Oriental_, this Author cannot conceive, how _Saturn_ could in all these different times have no difference in its _Phasis_, or keep always the same _Shadow_; seeing that, according to the _Hypothesis_ of the _Ring_, when it was _Oriental_, it must cast the _Shadow_ upon the _left_ side of the _Ring_ beneath, without casting any on the _right_ side: and when it was _Occidental_, it could not but cast it on the _right_ side beneath, and nothing of it on the other. Concerning the _Shadow above_, which _Campani_ affirms to be made by the _Ring_ upon the Body of _Saturn_, M. _Auzout_ judges, that there could be no such _Phaenomenon_, by reason of its _Northern Latitude_ at the times, wherein the _Observations_ were made, _vid._ in _April_ 1663; in the midst of _August_, and the beginning of _October_, next following, and in _April_ 1664, except it were in _October_, and the _Shadow_ strong enough to become _visible_.