Philosophical Society of Washington
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Founded in 1871, the Philosophical Society of Washington is the oldest scientific society in Washington, D.C. It continues today as PSW Science.
Joseph Henry, the society's first president
When the Cosmos Club moved in 1887 to the Dolley Madison House (shown here in 1883), the Society began holding its regular meetings there.
Cosmos Club
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The Cosmos Club is a 501(c)(7) private social club in Washington, D.C., that was founded by John Wesley Powell in 1878 as a gentlemen's club for those interested in science. Among its stated goals is, "The advancement of its members in science, literature, and art and also their mutual improvement by social intercourse."
Cosmos Club in December 2017
Cosmos Club at Lafayette Square, c. 1921
725 Madison Place
Cosmos Club on Lafayette Square