CREATE TABLE table_2318 ("School" TEXT, "Location ( s ) " TEXT, "Control" TEXT, "Type" TEXT, "Enrollment" FLOAT, "Founded" FLOAT)

What is the only type of university that was founded in 1873?
SELECT "Control" FROM table_2318 WHERE "Founded" = '1873'
SELECT "Control" FROM "table_2318" WHERE "Founded" = '1873'