relating to the Construction of the Heavens. 317 
30. Of Planetary Nebula. 
The objects of which I shall give an account in this article 
have so near a resemblance to planets, that the name of pla- 
netary nebulae very justly expresses their appearance ; for 
notwithstanding their planetary aspect, some small remaining 
haziness, by which they still are more or less surrounded, 
evinces their nebulous origin. In my catalogues the places of 
the following ten have been given . * 
IV. 18 is <£ A beautiful bright round nebula, having a pretty 
“ well defined planetary disk of about 10 or 12" in diameter. 
“ It is a little elliptical, and has a very small star following, 
“ which gives us the idea of a small satellite accompanying 
“ its planet. It is visible in a common finder as a small star/' 
Fig. 3 6. 
IV. 27 is “ A beautiful very brilliant globe of light, hazy 
“ on the edges, but the haziness going off' suddenly. I sup- 
“ pose it to be from 30 to 40" in diameter, and perhaps a very 
“ little elliptical. The light of it seems to be all over of the 
“ uniform lustre of a star of the 9th magnitude. The hazi- 
“ ness on the edges does not exceed the 20th part of the 
“ diameter." 
IV. 51 is “ A small beautiful planetary nebula, but consi- 
“ derably hazy upon the edges ; it is of a uniform light, and 
“ considerably bright, perfectly round, and about 10 or if' in 
<c diameter." 
IV. 33 is “ A pretty bright planetary nebula of nearly 1' in 
4 ‘ diameter; it is round, or a little elliptical; its light is uni- 
<c form, and pretty well defined on the borders." 
* See Planetary nebulas 17 . j, n, i8 , 26, 27, 34, 51, 53, 64, 70, 
