27d Diocese of the Pope as Bishop of Rome (4,3) _ _ L _ S _ _ 21d Impure mixture of metal sulphides produced during the smelting of sulphide ores, especially copper and nickel (5) M _ T _ _ 32d In geometry, a fixed reference point on the concave side of a conic section (5) _ _ _ _ _ 35a Son of Capys and Themiste in Greek mythology; father, by Aphrodite, of Aeneas (8) A _ _ _ _ S _ S Thanks in advance.