He conceiTCS^ That all Coiiiets do refpefl: the Si/^ as their 
King and Centre^ as Planets do^ making them a kinde of S'pfi - 
rioud Planets^ that emulate the true ones ia their Motion a!- 
moft in all things. 
ThtTrain^ he makes nothinp; elfe but theBeaiiis of the 
SuDj, falling on the head of the Comet, and paffing through 
the fameo refrafted and refiefted. And amongft his ohfcr^ 
Tjattonsand 5't'i?c^wofthis Cooietj there occurs one^ where- 
in the Tail i% mrve^ fo feen by him Decemh, if. He affigns 
thccaufes why the Trains do fo much vary^ and (hewsalfog 
on what depends their length. 
Whether the fame Comets return agaio^ as the Spots in 
the Sun? and. Whether in the time of great C^?;f/^;ft7w/i' 
they are more eafily generated? and whether they can be 
certainly foretold ^ with feverai other Inquiries^ he refers 
for to his great Bookj. 
As to Progf^ojiications^ he fomewhat complains^ That Men 
do more inquire what Comets then what they ^rcg 
or how they are generated and moved 3 profefling him/elf 
to be of the minde of thofe that would have Comets ra- 
ther ^^fe/r^^i thm feared 5 there appearing indeed no cogent 
reafoO) why the Author of Nature may not intend them ra- 
ther as Monitors of his Glory and Gpeatnefs^ then of his 
Anger ox Djfykafine\ efpecially feeing that fooie very dili- 
gent Men (among whom is Gemma Frifim^ t^]<.Q tioi\ctQ^ 
asgreat a number of good as EventSjConrequent to Co» 
metsi Siueca alfo relating^ That that Gom.et which appear*- 
cd inhis Timej was fohappy^ that icdid Com^tis d%trahere 
infa-'ium^ it cleared ihe credit of Gomet<?3 and made Peo-- 
pie have good thoughts of them* 
Having given fome Account of what may be look'd fox 
in this Prodromus^ it follows^ That fbme alfo fcould be ren* 
dredof the Ammadverfions Oientioo'd to have befr.nmade 
upon the fame. This was done by that Pariftan Philofopher 
Monfieur Au^out^ in a Letter of his to his Country-man 
Monfieur Petit \ in which be ftroogly conceivcr-j That this 
J rodromm 
