( ?8i ) 
% 
HI. A Letter from the d^eV. Mr. James Pound, 
(^flor of Wanftead, F. ^ S. to Vr. Jurin, 
Seer. S. concerning ObferVations made with 
Mr. Had ley V fie Bing Telefcope. 
I T were to be wifh’d, that with the particular De- 
feription given in a late Tranfadion (Numb, 376.) 
of the curious Mechanifm of that Catadioptrick Tele- 
fcope, which was made by Mr, Hadley^ and by him 
prefented to the Royal Society ^ that inoft ingenious 
Gentleman would have communicated alfo a full Ac- 
count of what Obfervations he had made with it, 
whereby the Publick might at length have been ap- 
prized of the Ufefulnefs of an Invention, (worthy of 
its great Author, Sir Ifaac Newton^ which, perhaps 
from the vain Attempts made by fome of putting 'it in' 
Pradice, hath lain negleded thefe 50 Years ; for it is 
fo long, (ince it was firft publifhed in the Philofophical 
TranfaBionSf Numb. 81. 
Mr. Hadley hath fufhciently convinced us, that this 
noble Invention doth not confift in bare Theory and 
it is to be hoped, that he, or fome other fuch curious 
and worthy Perfons, (who fcruple not at a little Pains 
and Coll:) will in a fhort Time find out a Method, ei- 
ther of preferving the concave Metal from tarnifhing, 
or of clearing it ealily when tarniihed, or elfe of ma- 
king a good concave Speculum of Glafs quicklilver’d on 
the Back- part. When a Method for either of thefe 
Ihall 
