SCHEMA:
CREATE TABLE table_2147588_3 (reason_for_change VARCHAR, date_of_successors_formal_installation VARCHAR)
USER:
What was the reason for change in staff in formal installations on March 15, 1865?

QUERY:
SELECT reason_for_change FROM table_2147588_3 WHERE date_of_successors_formal_installation = "March 15, 1865"