[ 610 ] 
I beg you will anfwer for me the questions pro- 
pped to me by our worthy friend Dr. Morton on the 
part of Mr. Dunn. I oblerved the exit of Venus at 
Paris with a telefcope of 1 8 feet, and an eye glafs of 
2 -L inches focus, and with a fmoaked glafs which was 
lufficiently dark, but I was not uncertain fo much as 
a Angle fecond. M. Meflier obferved with a Grego- 
rian telefcope of 2i feet, magnifying very nearly the 
fame as mine, and he agrees very well with me. 
M. Maraldi had a refracting telefcope of 1 5 feet, but 
he was tired at the time; and M. de la Caille’had 
a refra&ing telefcope of Mr. Dolland which was not 
well put together, and did not terminate objects dis- 
tinctly. I took for the moment of the contact the 
1 ft inftant of Venus’s limb raifing the fun’s limb in 
the flighted; manner. The account of thefe obferva- 
tions will be in the memoirs of the academy for 1761, 
which is almofl: printed oft. 
We reckon the longitude between Greenwich and 
Paris to be 9' 20" : but -I do not know what are the 
obfervations upon which it is founded. The preced- 
ing obfervations will contribute hereto. 
1 
C. Ohjcr - 
