(2217) 
We firfl ohfervd this very fame Spot both for figure^colour and 
bull^, to be re*enterd the Sun May 2 5^^^ when it feemd to be in a 
part of the fame lins it had formerly traced ^ and was entered a- 
boat ~ of its Diameter about 7 of the cloc\in the afternoon. At 
the fame time there appear d another Spot ^ which was jufl entred 
and appear d to be entred not above — part of the Sun s diame- 
ter. It appear d to be longefi towards the North and Southland 
portefi towards the Eafi and Wefi^ There feenfdto be dtfpers'i 
about it divers fmall clouds here and there. 
Thefe Obfcrvations were made, as the Noble Obfer- 
ver told us, with an excellent Telefcope, in the prefence 
of divers Gufious and Ingenious perfons, one of whom 
was Mr. Hoo}^ And difcourfiog of the thoughcs he had 
entertain'd touching the EfFefts of fuch Spots^he fuggefted 
this Inquiry, Whether they might not caufe a confidera- 
ble alteration both in the Body of the Sua it felf^ and iu 
our Air and the Bodies in it upon their diflipation ? 
Secondly^ we underftand, that at farts the Royal 
Ob[ervatory \ no'w a building for making Celeftial Dif- 
coverics, is very far advanced, and will fliortly be in a con- 
dition to be employed for the ufe intended ; whence we 
may expedt a confidcrable advancement of the Aftrono- 
mical Science* In the fame Edifice, which the faid 
/^rty^^ory maketh a part of, we are inform'd that there is^ 
befidesmany other rooms fit for Philofophical ufes and 
purpofes, a very deep Cave, having an hundred threefcore 
and ten fteps of dekent ; wherein many forts of Expert^ 
mentsare intended to be madej being of chat nature, that 
they require to be remote from the Sun^beamsand the o- 
pelE^ Air 5 fuch as are Thermometrical ones 5 and fuch as 
concern Refrigerations, Coagulations, Indurations, and 
Co^nfervations ofBodieSj and a thoufand things more. 
Thirdly ^siv^ hear, that the Learned Monfieur Mariotte is 
publifliing two very defirable Difcourfes^the one oiViJion^j 
upon which fubjcithe hath difcovered fomething new 
and confiderable : the other of the Art of LeveUing,vv\iCTt' * 
in he delivers many remarkable particulars about Refra- 
dion^ and the Errors, that may^ upon the account thereof, 
Kkk a be 
