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absorption appears bright bands bright lines brighter central portion central star cluster continuous spectrum dark lane DETAILS OF OBSERVATION diameter diffuse nebulosity disk Dispersion Measurer Lines edge edgewise effect elliptical elongated evidence fainter figure g slitless galactic globular cluster Greater Magellanic Cloud Haynes hydrogen hydrogen lines inclination indicated July km./sec Lick Obs LICK OBSERVATORY long in p.a. M. T. Exp major axis minor axis Miss Hobe N Miss Hobe N,N2 moderately bright Moore Miss Hobe Moore N,N nearly round nebular matter nucleus band object Orion nebula photographic planetary nebulae position angle probably radial velocity region relative intensities relative velocity Ring Nebula rotation s.n. Planetary Scott N Sept slightly oval Slit Remarks small nebulae spectra spectrograms spiral nebulae star of magn stellar condensations stellar nucleus ultra-violet under-exposed v. v. ft visible wave-lengths whorls Wilson Scott Wolf-Rayet Wolf-Rayet stars