Browse Items (1 total) Tags: Mattie Horn Browse All Browse by Tag Search Items Sort by: Title Creator Date Added Mattie Horn - Millikin University Student, Pi Beta Phi, Pi Mu Theta These are the glass negatives of Mattie Horn, a Millikin University student, and member of the Pi Beta Phi and Pi Mu Theta sororities. The photos were taken by Charles Wasson of Wasson Studios in Decatur IL in the early 1900s, and used in theā¦ Tags: c. 1910, Charles Wasson, Charles Wasson Photo Collection, Decatur IL, Glass Negative, Mattie Horn, Millidek, Millikin University, negative, Pi Beta Phi, Pi Mu Theta, Senior, Sophomore, Sorority, student, Wasson Studios, woman, yearbook Featured Item Pond in the Backyard Photograph of the pond in the backyard of the Roberts house.