PROC. AM. PHILOS. SOC. 



VOL. XLIX. NO. 194 



Plate XVII 



West 



Comet 1907 d (Daniel) on August 14, 1907, at 15'^ ii^ C.S.T. 



Exposure i'^ 201". Scale: i inch — 141 



3 4-inch Bruce Portrait Lens. Yerkes Observatory. 



