fuggeft what I have taken notice of in my reflexions upon 
former Comets, which is , that more of them enter into our 
Syfteme by the fign of Libra and about Spica virgink , then 
by all the other parts of the Heavens. For 5 both the pre- 
fent Comet , and many others regiftred in Hiftory , have 
entred that way, and confequently palled out of it by the fign 
Aries ^ by which alfo many have entred. 
I did found my Hypoihejis upon three Obfervations only, 
•viz. thole of the 22 5 2 6, and 31. of December. Nor have 
l done, as fome have fancied of me, who having been able 
to cblerve the Comet, the 27, 28, 29, 30, and 31. of Decem- 
ber , and to fee the diminution of its motion , have judged, 
that I had only determined that diminution for the time to 
come,conform to the augmentation thereof in time palled 
until the 29. of December. For January 1. (on which day I 
compofed my Ephemerides ) I knew not (nor any perlbn here) 
that the motion of the Comet did diminifh , but on the con- 
trary, moll: men believed , it was not the fame Comet. But 
Signlor Cajjini knows very well, that that was not neceflary, 
lecing that two portions of a Tangent being given , and the 
Angles anfwering thereunto* kis eafie to find the pofition and 
magnitude of its circle. The reafon,which I think the true 
one, of the diminution of its Motion in Longitude , and of 
its Retrogradation, by me conje&ured in my Ephemerides , I 
began to be allured of, Febr. 10. For until the fixth , the Co- 
met had alwaies advanced , as Signior Cajjini alfo hath very 
well noted .* but after that day , I found that it returned in 
augmenting alwaies its Latitude. And I have conftantly 
obierved it, until March 8. between many Stars, which muft 
be the fame with thefe mention’d by Cajjini , whereof the 
number was fo great , that I think, I faw of them March 6 . 
with one Aperture of my Glafs, more then 40. or 50. and e- 
Ipecially, above the head of Aries 5 but I did not particular- 
ly note the fituation of more than 12. or 15 $ among!} 
which I have obferved the pofition of the Comet fince Ja- 
nuary 28. every day, when the weather did permit, viz. 
January 29. February 3, 6,10,17, 19,24,26,27. and March 6, 
C 2 ' 7,8. 
