Question: List the number of vacators when successors were formally installed on June 22, 1868.
SQL: SELECT COUNT("Vacator") FROM "1-2417340-3" WHERE "Date of successors formal installation" = 'June 22, 1868';

Question: List all state classes when successors were formally installed on June 22, 1868.
SQL: SELECT "State (class)" FROM "1-2417340-3" WHERE "Date of successors formal installation" = 'June 22, 1868';