Question: What change caused a change of staff in March 9, 1865?
SQL: SELECT "Reason for change" FROM "1-2147588-3" WHERE "Date of successors formal installation" = 'March 9, 1865';

Question: Who was the successor for the New seat?
SQL: SELECT "Successor" FROM "1-2147588-3" WHERE "Vacator" = 'New seat';

Question: What was the reason for change in staff in formal installations on March 15, 1865?
SQL: SELECT "Reason for change" FROM "1-2147588-3" WHERE "Date of successors formal installation" = 'March 15, 1865';