He was President of the American . Issociation for the 

 Advancement of Science in 184-9; was chosen President of 

 the United States National Academy of Sciences in 1SGS; 

 President "of the Philosophical Society of Washington in 

 1871; and Chairman of the Light-House Board of the United 

 States in the same year; the last three positions he con tin a a I 

 to Jit J until his death. 



Professor %)Cimj made contributions to science in elec- 

 tricity, electro-magnetism, meteorology, capillarity, acous- 

 tics, and in other branches of physics ; he published valuable 

 memoirs in the transactions of various learned societies of 

 whichhe u-as a member; and devoted thirty-two years of 

 his life to making the Smithsonian Institution what its 

 founder intended it to be, an efficient instrument for the 

 "increase and diffusion of kjioivledge among men." 



M. R. Waite. 

 Chancellor of the Smithsonian Institution. 



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