[ 377 ] 
I have already made ufe of fome othef opportuni- 
ties, to convey my obfervation into England ; but not 
knowing whether it was received, I fend this prefent 
copy, which is both more copious, and fomewhat 
more corredf. 
Pingre, 
/ J?j; iff i i',- . >_• ... 
Of the Royal Academy of 
Sciences of Paris.- 
Lifbon, * 
March 6, 1762. 
! 
i 
vol mi- 
ce c 
LX. Ob» 
