Lowell, Percival, 1855-1916 · New York, The Macmillan company · leaf 68
ky we shall see by turningagain to the spiral nebulae. Of the two classes of nebulae which we contemplatedin the last chapter, the amorphous and the structural,there is more to be said than we touched on then. Not only in look are the two quite unlike, but the THE INITIAL CATASTROPHE 45… … Nebula Ijl V. 14 Cygni — after Roberts. the green, whence the name green nebulae. That ofthe spirals, on the other hand, is continuous, and there-fore white. The great nebula in Andromeda was oneof the first in which this was recognized; and the per-ception was pregnant, for no nebula defies…
Cosmogony
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