CREATE TABLE table_39584 ("Player" TEXT, "Touchdowns" FLOAT, "Extra points" FLOAT, "Field goals" FLOAT, "Points" FLOAT)

What was the highest number of extra points scored by Albert Herrnstein, when he scored more than 15 points total?
SELECT MAX("Extra points") FROM table_39584 WHERE "Player" = 'albert herrnstein' AND "Points" > '15'
SELECT MAX("Extra points") FROM "table_39584" WHERE "Player" = 'albert herrnstein' AND "Points" > '15'