Question: what is the total number of reasons for change where the date the successor was seated is June 8, 1876?
SQL: SELECT COUNT("Reason for change") FROM "1-2192067-4" WHERE "Date successor seated" = 'June 8, 1876';

Question: what is the reason for change where the date the successor was seated was July 28, 1876?
SQL: SELECT "Reason for change" FROM "1-2192067-4" WHERE "Date successor seated" = 'July 28, 1876';

Question: what is the district where the vacator is Vacant?
SQL: SELECT "District" FROM "1-2192067-4" WHERE "Vacator" = 'Vacant';