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This 1862 publication describes the flower structure of orchids and their pollination to illustrate aspects of Darwin's evolutionary theory.
A history and description of the Smithsonian Institution. "At first mainly a research center for scientific studies, the Smithsonian has developed in many directions and. . . includes museums devoted to air and space, science and technology, nature, and Americana; galleries of the fine arts, including the National Portrait Gallery and the Freer Collection; a zoo; various laboratories and observatories. ... [Attention] is given to the various directors of the Smithsonian."