CREATE TABLE table_74879 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT)

Which District has a First Elected of 1904 and an Incumbent of Duncan E. Mckinlay?
SELECT "District" FROM table_74879 WHERE "First elected" = '1904' AND "Incumbent" = 'duncan e. mckinlay'
SELECT "District" FROM "table_74879" WHERE "First elected" = '1904' AND "Incumbent" = 'duncan e. mckinlay'