TELESCOPIC TESTS—NEBULAE. 
Herschel observed the same object, and discovered in it a very 
remarkable feature, which the telescope of his father had failed 
to disclose. This object, as drawn by Sir John Herschel, is shown 
in fig. 15. The separation in what Sir William Herschel called a 
Fig. 14. 
halo or glory, and what Sir John Herschel calls a ring, was 
the remarkable character which Sir John discovered. Sir John 
conjectured, from the general appearance of the object, 
that the central round nebula is a globular mass of stars, too 
distant to admit of being resolved by his telescope, and that 
what his father called a glory, is an annular mass of stars 
surrounding the former and-split in the direction of its plane, 
so as to produce the appearance shown in the upper part of the 
figure. 
Sir John conjectured that such stellar masses might have some 
analogy to the mass of stars which forms the milky way, and of 
which our sun is an individual unit. 
20. How completely these speculations, ingenious as they were, 
were scattered to the winds, by bringing to bear on the same 
object a higher telescopic power, will be apparent by inspecting 
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