( ) 
by and compared with the four large ones which I 
made here. 
It was a great Pleafure to me, to fee by N°. 419. 
of the Thilofophtcal TranfaElions , that Mr. James 
Hodgfon has been at the Pains to calculate the E- 
clipfes of the four Satellites of Jupiter , which were 
to happen in the Year 1731. It was to be wifhed 
he would continue to dofo for the Years following $ 
but I would advife him, to do it a long while 
beforehand, that People in Foreign Countries might 
have Time to be informed of it. He fays, he has 
made ule ofTablesof the Satellites, which have not 
been corrected thefe 5*0 Years. * Probably he means 
the Tables of M . CaJJini^ publifhed at the Royal 
Printing-Houfe at Tar is, in 1693, at the End of 
the Obfervations of the Gentlemen of the Academy 
made in feveral Voyages. However, the late 
M. Cajfini , has from Time to Time made divers 
Correfiions to thofe Tables, though they never were 
made publick. M. Maraldi has alfo much worked 
at it after the Death of M. CaJJini , and has commu- 
nicated to me his Corrections, on which I have 
taken Pains to calculate new Tables ; but hav- 
ing in the Year 1724, received of Dr .Halley a 
Copy of his Aftronomical Tables, among which, 
are thofe of the four Satellites of Jupiter by 
Mr. Bradley , I judged there could not be any better, 
till fome Method fliall be found and explained 
geometrically to deduce from the Laws of Gra- 
vity, the EfFedt of the mutual Attraction of thefe 
Satellites on one another, and with relation to Ju- 
* 
7 He means Tables of the late Mr , Flamfteed. 
pitcr : 
