relating t o the Construction of the Heavens. 
11. Of treble, quadruple, and sextuple Nebulae. 
If it was supposed that double nebulae at some distance from 
each other would frequently be seen, it will now on the 
contrary be admitted that an expectation of finding a great 
number of attracting centers in a nebulosity of no great 
extent is not so probable ; and accordingly observation has 
shewn that greater combinations of nebulae than those of the 
foregoing article are less frequently to be seen. The follow- 
list however contains 20 treble, 5 quadruple, and 1 sextuple 
nebulae of this sort.* 
Among the treble nebulae there is one, namely V. 10, of 
which the nebulosity is not yet separated. “ Three nebulae 
“ seem to join faintly together, forming a kind of triangle ; 
“ the middle of which is less nebulous, or perhaps free from 
“ nebulosity ; in the middle of the triangle is a double star of 
‘Mhe 2d or 3d class ; more faint nebulosities are following.” 
Among the quadruple nebulae we have III. 358. “ Four 
“ nebulae, all within three minutes. The largest is faint and 
“ small ; the other three are less and fainter. They form a 
u small quartile, the largest being the most north of the pre- 
“ ceding side.” 
“ The nebulae which form the sextuple one are all very 
“ faint and very small; they take up a space of more than 
“ 10 or 12 minutes.” * 
* See treble nebulce. I. 17. II. 50, 123, 141, 171, 215, 392, 447. III. 85, 94, 
*17, 156, 3°°, 358, 382, 592, 873, 900, 943. V. xo. 
Quadruple. II. 482, 568. III. 356, 358, 562. 
Sextuple. III. 391. 
P p 
MDCCCXI. 
