1 649 ] 
None of the Emerfions could be feen for Clouds, 
Whilft Jupiter was im merging, the Sky was per- 
feftiy ferene and, at his neareft Approach to the 
Moon, he did not appear to alter his Figure in the 
lead, nor to be tinged with any prifmatic Colours ; 
neither did he (as is faid to have been fometimes 
obferved through redrafting Telefcopes) feem to enter 
at ail upon the Moon’s Body. 
That Part on the Moon’s Limb where Jupiter en- 
tered, was a Hollow 5 and though fome are of Opi- 
nion, that the Circumference of the Moon, as it is 
bounded to our Eye, is a perfeftly fmooth Circle, 
and that no Hills or Hollows appear there, as on the 
Surface of the Moon; yet if it be looked at in a 
clear Night with a good Telefcope, that magnifies 
about 100 times, or even lefs, it will be feen rugged 
and uneven all round. 
Notwithftanding Jupiter s Light feems to be more 
vivid than that of the Moon, when he is feen at a 
good Diftance from her, and far more fo when the 
Moon is away ; yet the contrary is plainly difeerned 
when they are near one another : And in this Obfer- 
vation, whilft Jupiter was immerging behind the 
Moon, his Disk appeared much dimmer, and of a 
more faint and dusky Complexion, than the Disk of 
the Moon. 
XXV. A 
