This window is probably the most important window in St Mary Church and the least viewed. This window is the Apparition of Our Lady to Bernadette Soubirous, a 14 year old girl in France. When Our Lady of Lourdes spoke to Bernadette she said "I am the Immaculate Conception". When Bishop Alter blessed the alter and corner stone he gave St Mary the designation of the Immaculate Conception. This is the only piece of art in St Mary with this direct designation. The window is located to the left of the main alter in the South West corner.