( 5i2f ; 
An AccBTtipt of fome Bool^f, 
V^frofe de Sigmri Academici di Bologna, in Bologna^ i6ji 
T His is a Complex of if. Difeourfes, at feveral times 
made by (everal perfons of thellluftrious Academy 
oi Bologna^ publi(h*d under the Prefidentftiip of the Noble 
Goxxnif^alerio J^nh Though thefe diflertations beallia* 
geoious and learned, each in^their kind y yec we (hall here 
chiefly take notice of the lafl: of them ( as moft fucable to 
thedcfign of thefe Tracts , ) compofed by the Excelleot 
Signor Montanari^ concerniog the admirable Changes and 
bther Novelties obferv'd in the Heavens. Touching which 
fubjecSt the Author fcruplesnot to affirm againft the tond 
Maincainers of the Immutability and Incorruptibility of the 
Celeftial Bodies, that there is not one Conftellation, which 
ferveth not for anInfl:anccof woudcrfulNovelties and fre- 
quent Changes, either by the AccelGon of New Stars not 
difcover'd before^ or by the Extinction of fome of thofe 
that had l^een obferv'd formerly^ or by increafe of 
L^ghtin fofhQ^ or the diminution of it in others. In the pro- 
ving of this AflTertion he is very patticular • yet fo that he 
referrs the Reader to a large Treatife, he is now preparing 
under the Title of the INSTABILITIES of the FIRM A? 
MENT; not doubting but that he (hall make it out to the 
AlTertors of the Incorruptibility of thefe Vifiblo Heavens , 
that even in the Stars anciently defcribed there are oblerv*d 
fuch Changes, as would be fufficient to make AnJlotkh\m' 
felf, if alive, change his opinion in this point* 
AmODgft the many particulars^ in which this Author in- 
ftanceth to make good his Affirmation, fuch as are the Con- 
ftellations of Andromeda, Perpuf, Vrfa, Draco^zndi altnoft 
all the Northern ones, he noteth, that, having of late years 
found a confiderable diverfity in the Pleiades^ and the nu- 
merous Stars there-about, from them as they were defcr'^ 
bed byG^A'fejhe hath taken the pains of delcribing them 
new by a Tdefcope of 20 palraes^Cthat is, about 1 37 foot,) 
and exhibited them in this very Traft. Nor 
