[ 57 ] 
The iecond rock (truck by Mofes is, I think, 43 
•feet long, 16 broad, 13 high; it has two cracks, ob- 
lique ones ; in them are feme mouths, like thofe of 
Meribah : it is of a hard (tone, not granite or marble. 
I have the exadt dimenfions and elevation of the 
fecond (lone, as well as of Meribah. 
IX. A Difcovery , with Obfervations , of two 
new Comets in the Marine Obvatory at 
Paris; by M. MefTier, F. R. S. and 
Member of the Academy of Sciences at 
Paris ; tranfated from the French , by M. 
Maty, M. D. Sec. R. S. 
Read March 20, April 24, X’ X 
and May 15, 1766. g 
day, I had a mind to 
look for the fatellite of Venus, which for fome years 
has been talked of. I employed, for this purpofe, an 
excellent Gregorian telefcope, of 30 inches focus » 
the great fpecuium of which, being fix inches diame- 
ter, magnified objedts about 100 times. I could dis- 
cover nothing with this inftrument, the planet appear- 
ing only furrounded with final Itelefcopic ftars. I like- 
wile made ufe of a very good achromatic telefcope of 
5 feet, conftrudted at Paris, and belonging to the Pr. of 
b. with which I difeovered at about 7 o’clock, and at 
lome diftance of Venus, a nebulofity of a fmall extent, 
Vol. LVI. I with 
N the 8th of March 1766, the 
1 fky having been clear the whole 
make ufe of this fine weather to 
