PROC. AM. PHILOS. SOC. 



VOL. XLIX. NO. 194 



Plate XXIII 

 West 



Comet 1907 d (Daniel) on September 2, 1907, at is^^ 51™ C.S.T. 



Exposure d^ i8"i. Scale : i inch = 39' 



lo-inch Bruce Portrait Lens. Yerkes Observatory. 



