of the Progrefi of the Studies^Labors, and attempts of the Cu- 
rious and Learned in things of this kind , as of their complete 
Difcoveries and Performances ; To theend, that fuch Produ- 
dions being clearly and truly commanicated ^ defires after fo- 
lide and ufeful knowledge may be further entertained ^ ingeni- 
ous Endeavors and Undertakings chcrifhed ^ and thofe^addi- 
fted^to and converfant in fuch Matters^may be invited and en- 
couraged to fearch^ tryj andfind out new things, impart their 
knowledge to one another ^ and contribute what they can to 
the Grand Defign of improving Natural knowledge , and p^r- 
fefting all Fhilofophical Arts^ OiuA Sciences, All for the Glory of 
God 5 the Honor and Advantage of thefe Kingdoms, and the 
Univerfil Good of Mankind. 
An AccoDft of the improvement (?/Optick Glaffes.. 
There came lately from Vark a Relation;^ concerning the Im- 
provement of Optk\GlajffeSy not long fince attempted at Rome 
by Signor Gmfippe Camp mi 5 and by him difcourfed of, in a Book, 
Entituled j Ragguaglia dimone Ojjerva^ioni ^ lately printed in 
the fiid City, but not yet tranfmitted into thefe parts 5 wherein 
thefe following particulars, according, to the Intelligence, which 
was lent hitherjare contained. 
The Fir/? regardeth the excellency of the long Telefiopes^m^tdQ 
by the faid Campani , who pretends to have found a way to 
work great Optick^ Glaffes with a Turne-tool , without any 
Mould; And whereas hitherto it hath been found by Experi- 
epce 3 that f/^al/ GlatTes are in proportion better , to fee with, 
upoathe Earth,then the great oncs^that Author affirms, that his 
are equally good for the Earth, and for making! Gbfervations jo 
the Heavens. Befidcs, he ufeth three Eye-Glaflcs for his great 
TeJeJcppes^whhout finding anyJw,or fuch Rain-bow colors,as do 
ufually appear in ordinary Glaiies, and prove an impediment to 
Obfervations, 
The Second^ concerns the CircU of Saturn^ in which he hath 
obferved nothing , but what confirms Monfieur chrijiian Hujr 
gens de Znlichem his Syfteme of thi^t Planet, publiflied by that 
worthy Gentleman in the year, 16^59, 
The 
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