In 1868 he was named director of the Antiquarium in Berlin, and during the following year, travelled to Cyprus in order to procure antiquities on behalf of the museum. Beginning in October 1869, he took an extended trip to Palestine, Egypt, Greece, Sardinia, Sicily and Italy.[1][2]
Praxiteles und die Niobegruppe, nebst Erklärung einiger Vasenbilder, 1855 – Praxiteles and the "Niobe group", along with an explanation of some vase paintings.
Kunst und Leben. Reisebriefe aus Griechenland, dem Orient und Italien, 1872 - Art and life; Letters from a journey to Greece, the Orient and Italy.[3]
Contributions to the 8 volume "Geschichte der bildenden Künste" (1866–1879); primary author Karl Schnaase.[4]
Was the author of a complete description of the Berlin Museum of Casts (1868; edition 2, 1885).[5]
Published in English: "Greek sculpture : selections from Friederichs' Bausteine"; translated by D. Cady Eaton, New Haven : Tuttle, Morehouse & Taylor, 1881-83.[6] (5 volumes):