The first appointment Father Morrison received was curate at St. Dunstan's Cathedral, Charlottetown. The following year he was named Professor of Philosophy at St. Dunstan’s College and he filled that position with such marked distinction that he was made Rector of that institution. Three years later he was appointed Rector of St. Dunstan’s Cathedral, Charlottetown. In time the responsibilities of Vicar General were placed upon his shoulders. In 1900 Father Morrison suffered a serious break- down in health. After recuperating it was deemed best to lighten his labors, and he was made parish priest of St. Joachim’s Church, Vernon River. Reverend Doctor Morrison soon regained robust health. His deep learning, his forcefulness of character and tried religious leadership were recognized by Rome, and on September 4, 1912, he was consecrated Bishop of Antigonish, Nova Scotia.

The career of His Excellency as Bishop of Antigonish was marked by the same steady progress and careful administration that distinguished his work throughout his previous charges.

During the thirty-eight years of his episcopate in the Diocese of Antigonish, many developments in the growth of the Diocese took place, such as new churches, schools, hospitals, colleges and other institutions.

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