Lowell, Percival, 1855-1916 · New York, The Macmillan company · leaf 41
conclusion that a spiral structure pervaded thegreat majority of all the nebulae visible. Their relativeuniversality W2ls outdone only by the invariability oftheir form. For they all represent spirals of one type: 20 THE EVOLUTION OF WORLDS two coiled arms radiating diametrically from a… … Nebula i^ I. 226 Urs^ Majoris — after Roberts. a huge spiral coiled in a plane not many degrees in-clined to the plane of sight. As should happen if the spirals are unrelated, left-handed and right-handed ones are about equally com-mon. In Dr. Roberts great collection of those inwhich the structure…
Cosmogony
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