NORTH AMERICA. 589 



WASHINGTON. 



War Department : Ordnance Department. 



Kcports of Experiments on the Properties of Metals for 

 Cannon, and the Qualities of Cannon Powder; with an 

 Account of the Fabrication and trial of a 15-inch Gun. 

 By Capt, T. J. Rodman, of the Ordnance Department, 

 U. S. Array. Boston, 1861. 4to. 



War Department : Topographical Bureau. 



Observations at the ^Magnetic and Meteorological Observa- 

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Medical Society of the District of Columbia. 



Medicine as a Science and an Art — its philosophy, influ- 

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 the Medical Society of the District of Columbia. By 

 Grafton Tyler, M. D. Washington, 1852. 8vo. pp. 35. 



Metropolitan Mechanics' Institute. 



A Record of the First Exhibition of the Metropolitan 

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Idem. Second Exhibition. 1855. 

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Constitution and By-Laws of the Metropolitan Mechanics' 

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Metropolitan Literary Association, 



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National Institute for the Promotion of Science. 

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