Letter from Spencer Baird to Charles Bell

Naturalist and Smithsonian administrator Spencer Fullerton Baird writes to his colleague Charles Bell. Baird thanks Bell for his "assistance in securing for us the magnificent collection of mining materials in the Canadian exhibit" of the 1876 Centennial International Exhibition in Philadelphia. Baird also mentions that he has written to an unspecified Major Sibley to ask about the collection of silver ores.