I. Hifioria Plant arum^ fpecies ha^ienus editas aliafque in- 
fufer mult as noviter invent its & defer ipt as compleciens^ &c. 
Antore Joanne Rajo e Societate Regia. Tomus frirms. Lon- 
dini, 1686. Fol. Afud Henricum Faithorne R. 6\ Typ(h 
graphtm ; adinfigne Rof^i inCosmeterio D, Pauli. 
II. Philofophia Naturdis PrincipU Mathematical Autore 
HI Newton, Trin. Coll. Cantab. Soc Mathefeos Profef- 
fore Lucafiano & Societatis Regalis Sodali* LondinL ^to, 
Projlat apud plures Bibliopolas 
An Account of a Comet feen ^ Lipfick, Sept i6S6.^ 
taken from the Lipfick Ada Eruditorum for the 
Month of Noveoiber laji. ^ 
THat Comets are fb frequently feen of late above 
what has been formerly oblerved, happens rather 
from the diligence and number of thole that now apply 
themfelves to the ftudy ofthe Goeleftid Motions, than 
from any cafual concourfe of thofe Bodies. That this is 
fo, may be concluded from the five Comets, that in lefs 
than fix years time have been feen ta traverfe the Heavens, 
of which yet only the two firfl: ( w^. thofe of^ r69i and 
168:?) by reafbn of their long tailes were generally regard- 
ed. That that appeared in '^uly 2cqA Augufi 16%"^. was 
not, as I can hear, any where obferved ia France. That 
that appeared in y.^;^^ 1684 was no where elfe taken no- 
tice of but at Rome: and now this of September i686. we 
have no other account of, than this from Lipftck. The truth 
is, that where Comets are deftitute of a tayle and appear 
only like an obfcure hazie Star, as thofeof 168 j. and 1684 
did, they that firil difcover them had need be wellac- 
' quainted 
