First informal schoolroom set up by Mary Kimball Morgan above a carriage house at her home, 4333 Morgan Street, St. Louis, Missouri.

The school officially opens at 4484-4486 West Morgan Street, October 17.

The name "Principia" adopted.

Dormitory for boarding students opens.

Mary Baker Eddy approves Mrs. Morgan's idea of founding a school and authorizes her to call it a "Christian Science school."

Gold and blue chosen as school colors.

Page Avenue campus purchased.

"As the sowing, the reaping" adopted as school motto.

First Upper School class graduates.

Alumni Association organized.

Board of Trustees established, along with the formal incorporation of the school.

First issue of The Principia Alumni Purpose magazine appears.

First class graduates from Junior College.

Dads' Club formed.

Progress at Principia magazine established.

First Christian Science lecture given at Principia by Bicknell Young.

The Principia Mothers' Club organized.

ABC League formed for interscholastic athletic competition for boys.

Ground broken for the Chapel, one of 13 buildings on the new College campus designed by distinguished architect Bernard Maybeck.

First bachelor of arts degrees conferred at College commencement ceremonies held in the Elsah Chapel.

College moves to Elsah.

First Alumni Weekend.

First Mothers' Club calendar produced.

First Public Affairs Conference, on the topic, "Making Democracy Work."

Accelerated war program inaugurated on Elsah campus, including extra physical conditioning.

Patrons' Association organized.

Property in St. Louis County purchased for new campus.

Golden Anniversary of Principia.

Publication of As the Sowing, the history of Principia's first 50 years.

First Summer Session for adults at the College.

Course in the history of the Christian Science movement introduced at the College.

Pre-Schoolers are the first to move to the new campus.

First Principia Abroad study/travel program.

Upper Schoolers complete the move to the new campus.

Education at The Principia>, a compilation of Mrs. Morgan's talks and writings, is published by the Trustees.

Inauguration of PACE (Principia Adult Continuing Education) Abroad programs.

First week-long alumni reunion.

College women's tennis team wins NCAA Division III national championships.

College athletic teams change name from Indians to Panthers.

Dawn Leonard Larmer is the first woman since Mrs. Morgan to be appointed to chair the Board of Trustees.

Lower School expansion and new classrooms added.

Maybeck renovations begin at the College.

College campus designated as a National Historic Landmark.

Construction begins on largest building project ever undertaken at the College, the Science Center.

Publication of A Century of Progress: A Pictorial History of The Principia.

Centennial year celebrations mark the 1997-98 school year.