C 597 ] 
*P. S. It having been an Opinion pretty generally 
received, that the darker Parts of the Moon's Sur- 
face are Water, I take this Opportunity to remark, 
that though thofe lefs lucid Spaces are for the moft 
part, to Appearance, evenly extended Surfaces, when 
Telefcopes of fmall magnifying Powers are made 
ufe of, yet, when they are examined with larger 
Magnifiers, it is eafy to difeern on them many 
Protuberances in a longitudinal Dire&ion ; and 
that thefe Rilings are really elevated above the 
common plane Surface, is paft all Queftion, from 
their proje&ing Shadows, always oppofite to the 
Sun : Moreover they are of the very fame Colour 
as the Plane they arife from, of the like fmooth 
Surfaces, without any fenfible Afperities j and in- 
variably the fame, under the like Pofitions of the 
Sun to the Moon, at leaft as far as I have been 
able to difeover in 12 or 1 y Years frequent Ob* 
fervations of them, 
Ja. Short. 
1 1112 
