Il8 A, STRON O M y,

Jupiter is observed with a Telescopeto have four Satellites, which move abQ ut

has but-little Similitude to the Surface of the Earth ><lthese Respects. ^

12. Since the Moon’s Surface appears to be somountainous and irregular, it has been a Question, git comes to pass that the bright circular Limb of J ^Dilk does not appear jagged and irregular, as wen ‘the Curve bounding .the light and dark Parts ? In y cswer to this, it must be considered, that if the Suf* a ^of the Moon had but. one Row of Mountains pl aC fjround the Limb of the List:, the said bright Limb. W® uthen appear irregularly indented ; but since the Surf' 1 j }is all over mountainous, and since the visible Limh^to be considered not as a single curve Line, but a l ast ^Zone, having many Mountains lying one behind allC ^ther from the Observer’s Eye, ’tis evident the

tains in some Rows being opposite to the Vales in oth^will fill up the Inequalities in the visible Limb in th emeter Parts, which diminish to the Sight and blendeach other, so as to constitute (like the Waves ofSea) one uniform and even Horizon. .

13. Whether there be Seas, Lakes, &c. in the jhas been a Question long debated, but now concL ^in the Negative : For in those large darker R c § 10 J( which were thought to he Seas) we view through aTelescope many permanent bright Spots, as alsoverris and empty Pits, whose Shadows fall within tn e ^_which can never be seen in Seas or any liquid Substaj 1 . j

Their' dark and dusky Colour may proceed from

of Matter or Soil which reflects Light less thanthe other Regions. .,5

14. These Spots in the Moon have continued fl ‘ j t )ithe fame unchangeably since they vvere sirst viewed ^a I clescope ; though less Alterations than what h a PP Sfin the Earth in every Season of the Year, by V eI,< Vj iSnow, Inundations, and the like, would have ca u * e , eChange in their Appearance. But indeed, as ther? ‘no Seas nor Rivers in the Moon, and no Atmoip 1,c ^