s^o Dr. Herschel's Astmiomical Observations 
at' different times, however, ought to make us cautious about 
assigning the cause of the difference in the observations. 
2. Of two Stars zvith nebulosity hetzveen them,^ 
A’ more remarkable situation than the former is that of two 
stars with nebulosity between them, or both included in the 
same nebulosity. 
in, 67 is “ An extremely faint nebulosity extended from 
“ one star to a smaller one, at the distance of about 2 minutes 
“ south of the former.'^ See fig. 2. 
II, 706. “ Two considerable stars are involved in a very 
“ faint nebulosity of 3 or 4 minutes in extent.'' See fig. 3. 
Here I have referred to 19 instances, where two stars have 
an extended nebulosity between them, or at least are both 
contained within it. Now, if we were to enter into a calcula- 
tion of chances to investigate the probability that in every one 
of these 19 objects, the stars and the nebulosity should be 
unconnected, we should have to consider that in order to 
produce this appearance by three objects at a distance from 
each other, it would be required that every one of them should 
be precisely in a given line of sight, and that the nebulosity 
should not only be in the middle of them, but that it also should 
be extended from the situation of one star to that of the other; 
and that all this should liappen in the confined space of a few 
minutes of a degree ; which cannot be probable. Then, if on 
the other hand we recollect that in the 8th, 9th, and 10th ar- 
ticles of my paper on the nebulous part of the heavens, I have 
given 139 double nebulas joined by nebulosity between them, 
* See nineteen double stars joined by intermediate nebulosity II, i6. 706. 732, 
III, 19. 32. 67. 68. 113. 126. 182. 200. 312. 376. 540. 637. 757. 785. 820. 854. 
