Teriod, Secundu ijh. i^'. 54". five 2 ^i-^ Rtv.fr mi. 
Teriod. Tertii, 7 59 ;9 22 /zi^c 4 •t\Rev,frimf, 
Teriod, Quarti. 16 18 y 6 yo /x'c 9 xlRev.frifTjt. 
Whence the Table of the firft Equation of the F/rfi 
Satellite^ pag.x^^j or Monfitm C a fiini's larger Table, 
may by an eafie Reduftion ferve the other three; the 
if^quation of the Secof?J being z rU.or twice the Minutes 
with half fo many Seconds as there are Minutes in the 
i^quation of the Firjl, and the greateft Equation there- 
of 1^1 8'. 3 The liquation of the Third is ^ times 
greater than that of the Fir/l^ and when greateft a- 
mounteth to z^- j8'. 29''. And the i^quation of the 
Fourth being 9 t| times that of the Firfi, is had by Sub- 
ftrafting i and from ten times the itquaiion of the 
jF/r/?, whence the greateft becomes 6^10'. 28". So 
that Num. r. and Num. II. as here colleded for the Firfiy 
may indifferently ferve all the reft. 
As to the Second ^Equation of the other Satellites , 
MonfieurCtf^»/ has, by his Pracepta Calculi (as is be- 
fore mentioned ) fuppofed the Minutes thereof to be 
increafedin the fame proportion; as infteadof 14'. 10''. 
in the Firft^ to be 28'. zy", in the Second^ 5*7'. 22". in 
the Thirdf and no lefs than 2^- 14'. 7". in the Fourth ; 
whereas if this fecond Inequality did proceed from the 
fucceffive propagation of Light, this Equation ought to 
be the fame in all of them, which Monfieur CaJ^^i fays 
was wanting to be fhewn, to perfefl: Monfieur Romers 
Demonftration ; wherefore he has rejeded it as ill found- 
ed. But there is good caufe to believe that his motive 
thereto, is what he has thought not proper to difcover. 
And the following Obfervations do fufEciently fuppiy 
theDefeft com]?!ained of in the making out of that 
Hypothefis. 
Anno 1676. O^oh. 2. StiL Nov, 6^- io\ 37". app, but 
5^- 5*9'. 37^^ iieq. time^ Monfieur Cajini at Paris obfer- 
ved the Emerfion of the Third Satellite from Jupiter s 
fliadow. 
