PROC. AM. PHILOS. SOC. 



VOL. XLIX. NO. 194 



Plate XVIII 

 West 



Comet 1907 d (Daniel) on August 17, 1907, at IS*^ 10"^ C.S.T. 



Exposure i^^ 30'^. Scale : i inch = 49' 



lo-inch Bruce Portrait Lens. Yerkes Observatory. 



