Smithsonian Report, 1949.—Spitzer PLATE 1 
1. THE COMPACT OPAQUE GLOBULE MAY BE A PROTOSTAR, CONTRACTING TO 
FORM A NEW STAR 
2. A TYPICAL SPIRAL GALAXY 
Both supergiant stars and interstellar clouds of obscuring matter are found only 
in these huge, flattened, rotating systems. (Yerkes Observatory photo- 
graph.) 
