Full text: Astronomy and cosmogony 

PLATE X 
NORMAL SPIRALS (s) BARRED SPIRALS (sb) 
Sa (N.G.C. 4594) 
SBa (N.G.C. 2859) 
Sb (N.G.C. 2841) 
SBb (N.G.C. 5850) 
Sc (iJ/101) 
SBc (N.G.C. 7479) 
Mt Wilson Observatory (Dr K. Hubble) 
Normal and Barred Spiral Nebulae
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