070 
which we fee in fwimming,\$V.} And I have never found it lower 
than in high Winds. * . . . . , , .> , 
I have divers times , upon difcerning Ths /tHthor °»fer- 
my Quickfilver to fall without any v.fible mm farticHUrlj „ ^ 
caufe at home, looked abroad;and round f rom w h ac points thofe 
fby the appearance of broken Clouds, or winds blow, that make the 
otherwife) that it had rained not far off, £hejckjilverth»s fub fide. 
though not with us : Whereupon, the Air 
being then lightened, our heavier Air (where it rained not) may 
havefin part 5 difcharged it felf on that lighter. 
A mere particular Account of thofe Obfervations about Jupiter , that 
were mentioned in Numb. 8. 
: Since the publifhing of Numb. 8. of thefe TranfaUions , where, 
among other particulars, fomefhort Obfervations were fet down 
touching both the shadow of one of Jupiter's Satellite , palling over 
his Body,and that Permanent Spot, which manifefts the Converfion 
of that Planet about his own Axis s there is come to hand an Ex- 
traU of that Letter, which was written from Rome, about thofe Dif- 
coveries, containing an ample and particular Relation of them, as 
they were made by the Learned Cajfini , ProfefTor of Aflronomy in 
the Univerfity of Bononia. That ExtraU , as it is found in the French 
Journal des Scavxms of Febr. 22. 1 666. we thus Englifh. 
Monfieur £4^22, after he had difcovered(by the means of thofe 
Excellent Glaffesof jo .palmes, or 35*. feet, made by M .Ccimpani) 
the Shadows, call: by the 4 Moons or S atellits of Jupiter upon his 
Diske, when they happen to be between the Sun and Him ; after 
he had alfo diftinguifhed their Bodies upon the Disk? of Jupiter f 
made the laft year fome Predictions for the Months ©f Augufi 
and September, noting the dayesand hours, when the Bodies of 
the faid Satellits and their Shadows fhould appear upon Jupiter , to 
the end that the Curious might be convinced of this matter by 
their own Obfervations. 
Some of thefe Predictions have been verified not only at Rome , 
and in other places of Italy , but alfo at Paris by M. Au-^out , the 
moft Celebrated andthemoft ExaCt of our Aftronomers 5 and in 
Holland, by M. Hugens . And we can now doubt no longer, of the 
rotation of the Satellits about Jupiter As the Moon turns about: the 
Earth s norbelieve 5 that Jupiter or his Attendants have any other 
XJght^than that,which they receive from the Sun* as fome did af- 
A a fure 
