If we consider first the cosmical vapor dispersed in
definite nebulous spots, its state of aggregation will
p 84
appear constantly to vary, sometimes appearing separated into round or
elliptical disks, single or in pairs, occasionally connected by a thread of
light; while, at another time, these nebulae occur in forms of larger
dimensions, and are either elongated, or variously branched or fan-shaped or
appear like well-defined rings, including a dark interior. It is
conjectured that these bodies are undergoing variously developed formative
processes, as the cosmical vapor becomes condensed in conformity with the
laws of attraction, either round one or more of the nuclei. Between two and
three thousand of such unresolvable nebulae, in which the most powerful
telescopes have hitherto been unable to distinguish the presence of stars,
have been counted, and their positions determined.
The genetic evolution -- that perpetual state of development which seems to
affect this portion of the regions of space -- has led philosophical
observers to the discovery of the analogy existing among organic phenomena.
As in our forests we see the same kind of tree in all the various stages of
its growth, and are thus enabled to form an idea of progressive, vital
development, so do we also in the great garden of the universe, recognise
the most different phases of sidereal formation.
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