[ * 5 I 2 * * * ] 
XXVIII. A Supplement to Monf Pingrc s 
Memoir on the Parallax of the Sun : In a 
Letter fro?n him to the Royal Society , 
‘Tranjlated by M. Maty, M. Z). F» R* S» 
Gentlemen, 
Read May 1 7, y Had the honour to fend you my me- 
! 7 6 4 * y mo ir on the Parallax of the Sun as de- 
duced from the obfervations of Venus } give me leave 
to add to it fome remarks which I have fince made, 
and communicated to our academy. The learned 
Societies of Europe, amongft which yours holds a 
moft diftinguifhed rank, will be the judges of the 
fuccefs of our expeditions. A definitive decifion wnJ 
probably not be formed till after the obfervation of 
the tranfit of 1769; in expectation of further ac- 
counts, which may tend towards this decifion, there 
is at leaft one which I now fubmit to your ex- 
amination. 
Supplement to my Memoir on the Parallax 
of the Sun. 
I impatiently expected the firft volume of the 
Philofophical Tranfadions of the year 1761, where 
I hoped to find fome obfervations that might deter- 
mine which of the obfervations, viz. that of Mefl. 
Mafon and Dixon made at the Cape of Good-Hope, 
or that which was made at the ifland Rodriguez by 
Mr. Thuillier and myfelf, deferved the preference. 
The firft reduces the Sun's Parallax to 8 f at moft, 
v 
