Conftruclron of the- Heavens. 2 65 
The fourth follows y Sa'-gittae ip 7 , 1 In time, aid is 2' more 
north. It is perfectly round, pretty bright, and pretty well 
•defined ; about | min. in diameter. 
The fifth follows the 2 iff Vulpeculae 2 7 , 1 in time, and is 
i°. 4b 7 more north. It is ex nelly round, of an equal light 
throughout, but pretty faint, and about T in diameter. 
The fixth precedes h (Fl. 39 ) Cygni 8 7 , x in time, and Is 
i° 26 7 more fouth. It is perfectly round, and of an equal 
light, but pretty faint ; its diameter is near L, and the edges 
are pretty well defined. 
The planetary appearance of the two firll is lo remarkable, 
that we can hardly fuppofe them to be nebulae ; their light is 
fo uniform, as well as vivid, the diameters fo fmall and well 
defined, as to make it almofl improbable they fhould belong- to 
that fpecies of bodies. On the other hand, the effedt of dif- 
ferent powers feems to be much againft their light’s being of a 
planetary nature, fince it prcferv.es its brightnefs nearly in the 
fame manner as the liars do in iimilar trials. If we would fup- 
pofe them to be fingle bars with large diameters we (hall find it 
difficult to account for their not being brighter ; unlefs we 
fhould admit that the intrinfic light of fome liars may be very 
much inferior to that of the generality, which however can 
hardly be imagined to extend to fuch a degree. We might 
fufpedl them to be comets about their aphelion, if the bright- 
nefs as well as magnitude of the diameters did not oppofe this 
idea ; fo that after all, we can hardly find any bypothefis fo 
probable as that of their being Nebula? ; but then they mult 
eonfifl of liars that are comp relied and accumulated in the 
highefl degree. If it were not perhaps too hazardous to purfue 
a former furmife of a renewal in what I figuratively called the 
Laboratories of the univerle, the liars forming: thefe extraordi- 
nary nebulae, by fome decay or walle of nature, being no longer 
Vql. LXXV . Man fit 
