PROC. AM. PHILOS. SOC. 



VOL. XLIX. NO. 194 



Plate XXI 



West 



Comet 1907 d (Daniel) on August 21, 1907, at 15^^ 36'" C.S.T. 



Exposure o^ 50"^. Scale : i inch = 56' 



lo-inch Bruce Portrait Lens. Yerkes Observatory. 



