Conjiruitkn of the Heavens . 2 &i 
us with the irrefolvable, much iefs with the colottrlefs and 
milky fort of nebulofities. 
A Perforated Nebula , or Ring of Stars . 
Among the curiofities of the heavens ihould be placed a 
nebula, that has a regular, concentric, dark fpot in the middle, 
and is probably a Ring of liars. It is of an oval diape, the 
Sorter axis being to the longer as about 83 to 100 ; fo that, if 
the liars form a cncle, its inclination to a line drawn from the 
fun to the center of this nebula mud be about 56 degrees. The 
light is of the refolvable kind, and in the northern fide three 
very faint liars may be feen, as alio one or two in the fouthern 
pait. The vertices or the longer axis feem lefs bright and not 
fo well defined as the red. There are feveral fmall dars very 
near, but none that feem to belong to it. It is the 57th of 
the Connoifance des Temps. Fig. 5. is a reprefen tation of it. 
Planetary Nebula. 
I diall conclude this paper with an account of a lew hea- 
venly bodies, that from their fmgular appearance leave mealmod 
in doubt where to clafs them. 
The drd precedes v Aquarii 5^4 in time, and is T more 
north. Its place, with regard to a fmall dar Sept. 7, 1782, 
was, Didance 8 7 but on account of the low filiation, 
and other unfavourable circumdances, the meafure cannot be 
very exaft. Augud 25, 1783, Didance f 5" 1 1 "\ very exadt, 
ana to my fatis faction ; the light being thrown in by an opaque- 
microfcopicdllumination (g). Sept. 20, 1 783, Pofition 4T 24' 
fouth 
(g) It may be of life to explain this kind of illumination for which the New- 
tonian reflector is admirably conftruded. On the fide oppofite the eye-piece an 
opening is to be made in the tube, through which the light may be thrown in, fo 
as to fall on fame reflecting body, or concave perforated mirror, within the eye- 
piece, 
