Photogmi.h ol LiiiUtuiiig Flaslji'.-. taken by Mr. F. II. Glew on the 

 28tli June. 1892, witli a lens mounted on the hammer of an electric bell, 

 vibratmg about nine times per second. 



Photograph taken diiriu;; a lieavv tliu)idrr>tonn at Xewca^tle on the 17th 

 July, 1891, at 10.1.5 p.m., by Mr. W. F. Dunn, and believed by him to be a 

 photogi'aph of Ball Lightning. 



The nearest house to the Lick Observatory, from a photograph taken 

 by Mr. S. W. Buexham. 



The eye-piece end of the gi'eat Lick 36in. Eefractor, from a photograph 

 by Mr. S'. W. Burnham. The camp-stool is standing on the movable floor 

 of the Observatory, which can be raised or lowered by hydraulic machinery. 



