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;

In the _First Section_, of the different Method, to be employed in the cure
of Feavers, not only in respect of the differing constitutions and ages of
the patients, but also in regard of the differing seasons of one and the
same year, and of the difference of one year from another. As to the
_Former_, he shews, in what sorts of _Patients_, and at what time of the
Feaver, Phlebotomy, or Vomiting, or both, are to be used; and when and
where not: In what space of time the _Depuration_ if nature be not
disturbed or hindred in her work, will be perform'd: When _Purgatives_ are
to be administred: How that _Diarrhea's_ happen, if the _Patient_ had in
the {211} beginning of the Feaver an inclination to vomit, but no vomit was
given; and that those symptoms, which commonly are imputed to a malignity,
do, for the most part, proceed from the Relaxation of the tone of the
Bloud, caused by Medicines too refrigerating, or by t