with Remarks on the Construction of its different Parts . 127 
The Return of the Comet to the nebulous Appearance. 
From the observations of the decreasing length of the tail, the 
diminution of brightness and increased scattering of the streams, 
and from the gradually fainter appearance of the transparent 
atmosphere, brought on by the contraction and more scattered 
condition of the envelope, I had reason to suppose that all the 
still visible cometic phenomena of planetary body, head, at- 
mosphere envelope, and tail, would soon be reduced to the 
semblance of a common globular nebular; not from the in- 
crease of the distance of the comet, which could only occasion 
an alteration in the apparent magnitude of the several parts, 
but by the actual physical changes which I observed in the 
construction of the comet. 
The gradual vanishing of the planetary Body. 
Nov. 4. 10 feet reflector. I saw the planetary disk with 
289. It was rather more eccentric than usual. 
Nov. 9 , 1 saw it imperfectly with 169. It was more visible 
with 240 ; but the nebulosity of the envelope overpowered its 
light already so much that no good observations could be 
made of it. 
Nov. 10. Large 10 feet. I had a glimpse of the disk and 
its eccentricity, 
Nov. 13,1 tried all magnifiers, but could no longer perceiy© 
the planetary body. 
