C z6 5 ] 
We all four very well faw thefe mountains, and 
we certify their exigence. The three firft feemed to 
have hollows between them, which penetrate a little 
into the moon ; all the reft projected out of the 
difc. 
The clock was verified by the meridian the fix 
following days. The whole is referred to the meridian 
and point of Calais; and it appears that the time 
marked for the new moon of that day requires a 
re&ification. Signed, 
Prince de Croy, De Fourcroy, chief Engnieer, 
Gamier, Engineer : Mouron* 
Remarks on the Eclipfe of the 1 6 th of Auguft 1765 at 
Calais, with regard to the Atmofphere , and the Moun- 
tains feen in profile. 
The Atmofphere . 
Upon mature confideration, I think the moon’s 
atmofphere perceptible, fee Fig. 1 . 1 . Becaufe the two 
fmall elevations, which I conftantly faw of the fun’s 
limb, towards the cufps, is eafily diftinguifhed in the 
large telefcope, through which the other parts appeared 
very exactly defined. It is true that the fun appears 
equally bright at the place of this fmall elevation, but 
the atmofphere cannot affedt its brightnefs, and can 
only fomewhat raife the rays, which pervade or Hide 
over a denfer medium. 
2. Becaufe this elevation is gradual, riling higher 
towards the moon, according to the degree of the 
denfity of its atmofphere. 
Vol. LVi. 
M m 
3. BeCaufe 
