• _ _ ( 2 ) 
of the Progrels 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 the end, that fuch Produ- 
ctions being clearly and truly communicated , defires after fo- 
lide andufeful knowledge may be further entertained , ingeni- 
ous Endeavors and Undertakings cherifiied , and thofe, addi- 
cted to and converfant iivfuch Matters, may be invited and en- 
couraged to fearch, try, and find out new things , impart their 
knowledge to one another , and contribute what they can to 
the Grand Defign of improving Natural knowledge , and per- 
fecting all Philofophical Jrts 0 and Sciences. All for the Glory of 
God, the Honor and Advantage of thefe Kingdoms, and the 
Univerfal Good of Mankind. 
An Account of the improvement of Optick Gaffes. 
There came lately from Park a Relation, concerning the Im- 
provement of Optic k^GlaJJes, not long fince attempted at Rome 
by Signor Giufeppe Campani , and by him difcourfed of, in a Book, 
Entitul ed 0 Ragg-uaglio di nuoue Ofjervationi ^ lately printed in 
the laid City, but not yet tranfmitted into thefe parts , wherein 
thefe following particulars, -according to the Intelligence, which 
was fent hither,a¥e contained. 
The Firji regardeth the excellency of the long Telefcopes, made 
by the faid C timpani , who pretends to have found a way to 
work great Optick, Gljifes with a Turne-tool * without any 
Mould : And whereas hitherto it hath been found by Experi- 
ence , that [mall Glafles are in proportion better,, to fee with, 
upon the Earth, then th q great ones^that Author affirms, tnat his 
are equally good for the Earth, and for making Obferyations in 
the Heavens. Befides, he ufeth three Eye-Giafles for his great 
Telejcopes 0 without finding any Iris ,or fuch Rain-bow colors,as do 
ulually appear in ordinary Glafies, and prove an impediment to 
Qbfervations. 
The Second , concerns the Circle of Saturn , in which he hath 
©bferved nothing , but what confirms Monfieur chrijiian Huy- 
gens de zulichem his Syffceme of that Planet s publiffied by that 
worthy Gentleman in the year, 1659- T , 
