Knowledge. 





THE DUMB-BELL NEBULA. 



From a Photograph by Mr. W. E. Wiisox, taken August 6th, 1894, 

 with an exposure of twenty minutes. 



THE CLUSTER IN HERCULES (13 MESSIER). 



From a Photograph taken 2nd September, 1894, by Mr. W. E. Wilson, 

 with an exposure of fifteen minutes. 



THE DUMB-BELL NEBULA IN VULPECULA. 



From a Photograph by Mr. W. E. Wilson, with a reflector of two feet aperture, and focal length of t«n feet six inches. 



Taken 6th August, 1894, with an exposure of twenty minutes. 



Dirt'ct Pho(o Engraving Company, 9, Barjisbury Vark, N. 



