CREATE TABLE table_28848 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What was the district of the incumbent Mathias Morris?
SELECT "District" FROM table_28848 WHERE "Incumbent" = 'Mathias Morris'
SELECT "District" FROM "table_28848" WHERE "Incumbent" = 'Mathias Morris'