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XXVIII, ExtraBs of three Letters of Sir 
F. H. Eyles Stiles, F. R. S, to Daniel 
Wray, Efq\ F. R, S, concer?nng fonie 
7iew Microfcopes made at^ Naples, and their 
life in viewing the fmalleft OhjeBs. 
Naples, nth Auguft, 1761, 
Dear Sir, 
Read Nov. 7, ✓^Aptaln Hood, of the Veftal man of 
of war, having failed from hence for 
Leghorn the 3d inftant, I took the opportunity of 
fending you by him a fmall Box, put into my hands 
by Father di Torre, containing four of his fpherical 
GlalTes for the Microfcope, which he had defired 
me to tranfmit to England, as a prefent from him 
to the Royal Society, which he hopes will prove as 
acceptable as he wifhes. The diameters of the 
glades, and their magnifying powers, are as follows. 
Clafs. Dratneter. Ma|;nifying powers, 
ift. Near two Paris points, 640 times, and upwards, in diameter, 
ad. One Paris point, . jzSo 
3d, One Paris point, 1280 
4th, Half a Paris point, 2560. 
% 
The paper, which enclofesthe laft of thefe,has the 
following fuperfcription. 
« Igne puriffimo generatum incredibili patientia 
. **' cucullis orichalceis inclufum globum primum 6c 
unicum diametri punfti dimidii Parifienfis, qui 
‘5 objecStorunx 
Z 
