I N T R 1) U C T R Y L E r r T E R . 



Washington, July 4th, 1860. 

 Professor Joseph Henry, LL.D., 



Secretary of the Smithsonian Institution: 



Dear Sir: The records of the tidal observations made under the direction of 

 Dr. Kane, in the second Grinnell Expedition to the Arctic Regions, were placed 

 in my hands by his late lamented father, Judge Kane, in December, 1857. 



Dr. Kane had selected Assistant Charles A. Schott, of the U. S. Coast Survey, for 

 the reduction of a considerable portion of the observations made on that expedi- 

 tion ; and I, therefore, placed them in Mr. Schott's possession for reduction, and 

 recommend his paper for publication in the " Smithsonian Contributions to 

 Knowledge." It is proper to state that the computations were at the expense of 

 the Smithsonian Institution. This is the sixth and last paper of the series. 



Very respectfully, yours, 



A. D. BACHE, 

 Superintendent I'. S. Coast Survey. 



