, REPORT OF THE SECRETARY. 15 



The Annual Reports to Congress consist, each, of an octavo volume 

 of 450 pages. They contain the report of the Secretary on the 

 operations and condition of the Institution, the proceedings of the 

 Regents, and an appendix, giving a synopsis of the lectures delivered 

 at the Institution, extracts from correspondence, and articles of a' 

 character suited to meteorological observers, to teachers, and other 

 persons especially interested in the promotion of knowledge. 



The thirteenth volume of the Contributions has been completed, 

 and is now in the hands of the binder. It contains the following 

 original papers : 



1. Tidal Observations in the Arctic Seas ; by Elisha Kent Kane, 

 M. D ; made during the second Grinnell Expedition in Search of Sir 

 John Franklin in 1853-55. Reduced and discussed by Charles A. 

 Schott, assistant United States Coast Survey. 



2. Meteorological Observations in the Arctic Seas ; by Sir Leopold 

 McClintock ; made on board the Arctic searching yacht "Fox" in 

 Baffin's Bay and Prince Regent's Inlet in 1857-59. Reduced and dis- 

 cussed by Charles A. Schott, assistant United States Coast Survey. 



3. Ancient Mining on the shores of Lake Superior. By Charles 

 Whittlesey. 



4. Discussion of the Magnetic and Meteorological Observations 

 made at the Girard College Observatory, Philadelphia, in 1840-45. 

 Part II. Investigation of the Solar-Diurnal Variation of the Magnetic 

 Declination and its Annual Inequality. By A. D. Bache, Superin- 

 tendent Coast Survey. 



5. Part III. Investigation of the Lunar Effects of the Magnetic 

 Declination. By A. D. Bache. 



6. Parts IV, V, VI. Horfeontal Force. Investigation of the ten 

 or eleven year period, and of the disturbances of the horizontal 

 component of the magnetic force ; investigation of the solar-diurnal 

 variation and of the annual inequality of the horizontal force, and of 

 the lunar effect on the same. By A. D. Bache. 



7. Records and Results of a Magnetic Survey of Pennsylvania and 

 parts of adjacent States in 1840, 1841, with some Additional Records 

 and Results of 1834, 1835, 1843, and 1862, and a Map. By A. D. 

 Bache. 



8 . Researches upon the Anatomy and Physiology of Respiration in 

 the Chelonia. By S. Weir Mitchell, M. D., and George R. More- 

 house, M. D. 



Accounts have been given in previous reports of all the papers 

 contained in this volume, excepting that" on the Chelonia. This 



