_Eustachio de Divinis_ (saith the _Informer_,) has written a large Letter, wherein he pretends, that the Permanent Spot in _Jupiter_ hath been first of all discovered with _his_ Glasses; and that the P. _Gotignies_ is the first that hath thence deduced the Motion of _Jupiter_ about his _Axis_; and that Signior _Cassini_ opposed it at first; to whom the said _Gotignies_ wrote a letter of complaint thereupon. The same _Eustachio_ pretends likewise, that his great Glasses excell those of _Campani_; and that in all the tryals, made with them, they have performed better; and that _Campani_ was not willing to do, what was necessary for well comparing the one with the other. _viz._ To put equall _Eye-glasses_ in them, or to exchange the same Glasses. The said _Divini_ affirms also, that he hath found a way to {210} know, whether an Object glass be good or not, onely by looking upon it, without trying. This would be of good use, especially if it should extend so far as to discerne the goodness of such a glass, whilst it is yet on the Cement. * * * * * _An Account of Dr. _Sydenham's_ Book, entituled, _Methodus Curandi Febres, Propriis observationibus superstructa_._ This _Book_ undertakes to deliver a more certain and more genuine Method of curing Feavers and Agues, than has obtained hitherto: And it being premised, _First_, that a Fever is Natures Engine, she brings into the field, to remove her enemy; or her handmaid, either for evacuating the impurities of the blood, or for reducing it into a New State: _Secondly_, that the true and genuine cure of this sickness consists in such a tempering of the Commotion of the Blood, that it may neither exceed, nor be too languide: This, I say, being premised by the Author, he informs the Reader;