The University of Montana, Missoula, senior women’s honorary association, Penetralia, was established in 1904 and attained national recognition or charter in 1927 when it became known as the Penetralia Chapter of Mortar Board. This organization was originally formed as a secret society dedicated to promoting a spirit of devotion and loyalty to the University of Montana. It did not remain secret for long but continued to direct its focus toward promoting the ideals of the university. By the 1920s members were chosen as juniors, based on their meritorious work on campus during their first three years, to serve during their senior year. Later, the criteria included scholarship. Mortar Board continues today as a national honor society that recognizes college seniors for their achievements in scholarship, leadership and service, provides opportunities for continued leadership development, promotes service to colleges and universities, and encourages lifelong contributions to the global community
From the guide to the Penetralia Chapter of Mortar Board Records, 1904-1949, (University of Montana--Missoula Maureen and Mike Mansfield Library Archives and Special Collections)