r 79 1 
AnExtraSiof the Journal Des Sea vans, of April 2 a 
y?. N. 1686". Gmingan account of two new Satel- 
lites of Saturn, difco^ered lately by Mr. Caffini at 
the Royal Ohferz^atory at Paris. 
THe Variety of wonderful Difcoveries, which have been 
made this Century in the Heavens, fince the in- 
vention of tho Telefcope, and the great Utility that may 
poflibly be drawn therefrom, for perfefting natural Know^- 
ledg, and the Arts necefTary to the Commerce and Society 
of Mankind, has incited Aftronomers more ftriftly to Exa- 
mine, if there were not yet fomthing confiderable, that had 
Hot been hitherto perceived. 
The diligence of thofe that have gon before, having left 
only the moft difficuk and obfcure ObjeQis to dilcover, 
thefe Sae/Iifesof Saturn which are eminently lb, byrea- 
fbn of their Smallnefi and great Diftance from the Sun and 
Earth, have fallen to the fliare of Sig^. Caffim ; who being 
furnifhed with Telefcopes of an extraordinary length and 
goodnefs, has been able to fee deeper into the Heavens, 
than thole that have hitherto attempted. Mr. Hugens in- 
deed found out one of them, viz, the fourth and biggeft a- 
bout thirty Years fince, and made out the Theory of the 
King or Anfa of Smrn till then unknown ; but it feems 
there remained yet four others to difcover. The middlemoft 
and outermoft, or third and fift ^ign. Cafftni dilcovered in 
the years 1671,72 and 7^, an account whereof is to befeen 
at large in Number 92 of thefe Tranfaftions ; the two in- 
nermoft were relerved to this prefent time for the fame Ob- 
ferver, having now lately gotten yet better Telefcopcs, The 
account he gives of thefe Dilcoverys is as follows. 
L The 
