World-life; or, Comparative geology . Fig. 8. Spiral Nebula ix Canes Vexatici, Herschel 3. Spiro-annular N^ebulce.—These seem to be undergo-ing a transition from the spiral to the annular form. H. 604 (Figure 9) is one ofthese. Another equal-ly transitional is (Figure 10), inwhich we see severalsegments of spiral orannular forms sur-rounding a bright nu-cleus, as in H. spectra of thesenebulae are also un- Spiro-axsular Nebula, Herschel 604. known.* * This, like most of the other nebular types mentioned may be found wellfigured in Schellens Spectral Analysis, and bet
World-life; or, Comparative geology . Fig. 8. Spiral Nebula ix Canes Vexatici, Herschel 3. Spiro-annular N^ebulce.—These seem to be undergo-ing a transition from the spiral to the annular form. H. 604 (Figure 9) is one ofthese. Another equal-ly transitional is (Figure 10), inwhich we see severalsegments of spiral orannular forms sur-rounding a bright nu-cleus, as in H. spectra of thesenebulae are also un- Spiro-axsular Nebula, Herschel 604. known.* * This, like most of the other nebular types mentioned may be found wellfigured in Schellens Spectral Analysis, and better in The Popular Science. NEBULA. 45
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