Question: What was the reason for change in staff in formal installations on March 15, 1865?
Schema: create table table_2147588_3 (reason_for_change varchar, date_of_successors_formal_installation varchar, PRIMARY KEY (reason_for_change))
SQL: select reason_for_change from table_2147588_3 where date_of_successors_formal_installation = "march 15, 1865"