rs, than the communicating to such, as apply their
Studies and Endeavours that way, such things as are discovered or put in
practise by others, it is therefore thought fit to employ the _Press_, as
the most proper way to gratifie those, whose engagement in such Studies,
and delight in the advancement of Learning and profitable Discoveries, doth
entitle them to the knowledge of what this Kingdom, or other parts of the
World, do, from time to time, afford, as well {2} of the progress of the
Studies, Labours, and attempts of the Curious and learned in things of this
kind, as of their compleat Discoveries and performances: To the end, that
such Productions being clearly and truly communicated, desires after solid
and usefull knowledge may be further entertained, ingenious Endeavours and
Undertakings cherished, and those, addicted to and conversant in such
matters, may be invited and encouraged to search, try, and find out new
things, impart their knowledge to one another, and contribute what they can
to the Grand design of improving Natural knowledge, and perfecting all
_Philosophical Arts_, and _Sciences_. All for the Glory of God, the Honour
and Advantage of these Kingdoms, and the Universal Good of Mankind.

* * * * *

_An Accompt of the improvement of_ Optick Glasses.

There came lately from _Paris_ a Relation, concerning the Improvement of
_Optick Glasses_, not long since attempted at _Rome_ by Signor _Giuseppe
Campani_, and by him discoursed of, in a Book, Entituled, _Ragguaglio di
nuoue Osservationi_, lately printed in the said City, but not yet
transmitted into these parts; wherein these following particulars,
according to the Intelligence, which was sent hither, are contained.

The _First_ regardeth the excellency of the long _Telescopes_, made by the
said _Campani_, who pretends to have found a way to work great _Optick
Glasses_ with a Turne-tool, without any Mould: And whereas hitherto it hath
been found by Experience, that _small_ Glasses are in proportion better to
see with, upon the Earth, than the _great_ ones; that Author affirms, that
his are equally good for the Earth, and for making Observations in the
Heavens. Besides, he useth three Eye-Glasses for his great _Telescopes_,
without finding any _Iris_, or such Rain-bow colours, as do usually appear
in ordinary Glasses, and prove an impediment to Observations.

The _Second_, concerns the _Circle of Saturn_, in which he hath