| Penn's Tau chapter was established May 5, 1891 and appeared
in The Record of that year. The national organization was founded in
1833 at Union College in Schenectady, New York. In May 1990 the University ordered
Delta Upsilon to vacate its house at 300 South 36th Street. In September 1998
the Tau chapter was permitted to re-occupy its house; the fraternity remains active
in 2003. In 1833, Psi Upsilon pioneered a new and innovative method of fraternal
organization at Union College which "completely revamped" previously
existing ideas: it drew pledges from all undergraduate classes. Its motto was:
"To us has befallen a mighty friendship." Rev. Samuel Goodale is generally
credited with being first among the seven founders of Psi Upsilon, the others
being Robert Barnard, Sterling Goodale Hadley, Charles Washington Harvey, Edward
Martindale, Merwin Henry Stewart, and George Washington Tuttle. Penn's Tau
chapter was Psi Upsilon's twentieth. Penn's chapter founded by Charles S. Dolley
and Henry Clark Johnson. There were thirty charter members. The Tau chapter
has been located at 300 South 36th Street almost from the time of its inception.
In the mid 1890s, the fraternity moved to rented space at 206 DeKalb Square, demolished
the old house on 36th Street, and built the present house. Beginning in 1899 and
continuing for nearly a century, Psi Upsilon occupied the most impressive fraternity
house on Penn's campus, the "Castle," at the southwest corner of 36th
Street and Locust Walk. 
Psi Upsilon fraternity house, 1900
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