Glass positive of Hubble's classification of Nebulae (Extra-galactic, elliptical and irregular). Shows: E.0.N.G.C.3379; E.2.N.G.C.221 (M.32); E.5.H.G.C.4621 (M.59); E.7.N.G. C.3115; N.G.C.3034 (M.82); N.G.C.4449. Plate XIV Mount Wilson Contribution No.324. 12"x15" . Prepared from celluloid positive lent by Sir James Jeans.
