p C 3 3 
feould not apptar in the like manner. But* Twill determine 
nothing of any of thefe things. When I fhall hereafter have 
made more frequent Obfervations of the Moon with my 
gnat Telefcopes , in convenient time, I fhall then perhaps learn 
more of it, than I know at prefen t, at leaft it will excite the 
Curious t o endeavor to make the like Observations^ and it^ 
may be, others, that. I have not thought of. 
The Inflame of the fame Perfon to Mr, Hook, for 
communicating hk Contrivance of mafing^with a 
i jlafs of a Sphere of to or 40 foot diameter,^ Te~ 
kfcope drawing feveral hundred foot^and his of- 
fer of recompenfing that Secret with anotherjeach - 
ing To meafure with ^Telefcope the Diftances 
of Ob) efts upon the Earth » 
In Numb. 4. Of thefe Papers, pag. 6y, Mr. Hoof had inti* 
mated, that he would (hortly difcover a way of his, with a 
Hano-convex Glallb of a Sphere of 20. or 40. feet Diameter , 
without Peines, and truly wrought of that Figure, to make 
a Telefcope, that with a Angle Eye.glafs fhould draw 300, 
400, yea 1000 feet, without at all altering the Convexity : 
Monfieur Auzout returns this confideration, and offer upon 
it, which follows 
To perform {faith he ) with a lejffer ObjeU -glafs the effed of 
a great Telefcope , we muft find out a way to make 
ftich an ObyM'glafs to receive as many Hayes as one will, 
without their being fenfibly diftant from one another 5 to 
the end, that by applying to it a ftfonger Eye*gUff there 
may be (fill Beams enough tofee the Ob j eft, and to oblite- 
rate the fmall fpecks and imperfedio is of the Ey-glafr. 
And if Mr. Hoof hath this Invention, I efteem it one of the 
greateft, that can be found in the matter of Telefcopes, if 
he pleafe to Impart it to us, we (hall b© obliged to him 3 and 
I wifb, 
