Vill CONTENTS. 



LECTURES OF THE PUBLIC COURSE OF 1890-9L 

 November 24, 1890. 



FREDERICK H. CHAPIN, ESQ. 



PAGE 



Cliff Dwellings of the Mancos Canons 44 



December 15, 1890. 



H. CARRINGTON BOLTON, PH.D. 



Life and Scenes in the Hawaiian Islands 47 



January 19, 1891. 



PROF. A. J. DUBOIS. 



Science and Miracle 54 



February 16, 1891. 



W. GOOLD LEVISON. 



Instantaneous Photography as an Aid to Science, History, and Art. 66 



March 16, 1891. 



PROF. CHARLES SPRAGUE SMITH. 



The Orkneys and Shetland 109 



April 20, 1891. 



FRANCIS B. CROCKER, E.M. 



Practical Applications of Electricity 1 16 



3Iay 18, 1891. 



CHARLES F. COX, A.M. 



What is a Diatom ? 119 



