GENERAL AUTHORITIES ON TECIINIQUE  .—Hamerton, The Graphic Arts: A Treatise on the Varieties of Drawing, Painting and Engraving (London, 1882), a work combining technical and artistic information, is the best single book on this subject . More archaeological is Berger, Beitrage zur Entwickelungs-Geschichte der Maltechnik (Munich, 1897–1904; partly in second editions . The last part is yet to come) . The series Quellenschriften fur Kunstgeschichte and Kunsttechnik des Mittelalters and der Renaissance (Vienna, various dates from 1871) contains many publications of much value, among them being, i., Cennino Cennini, Das Buch von der Kunst, German trans. of the Trattato, with note by Ilg; vii., Theophilus, Schedula diversarum artium, Ger. trans. by Ilg . Cennino's Trattato has also been edited in English by Mrs Hertingham (London, 1899) . Mrs Merrifield, Ancient Practice of Painting (2 vols., London, 1849), and Sir Charles Eastlake, Materials for a History of Oil Painting (2 vols., 1849 and 1869), are valuable standard works . Information as to Byzantine processes is to be found in the Mount Athos Handbook in " Manuel d'iconographie chretienne grecque et latine," by Didron the elder (Paris, 1845) . Church, The Chemistry of Paints and Painting (3rd ed., London,19o1), is by far the best book on its subject . Vasari on Technique, trans. by Miss Maclehose and edited with commentary by Baldwin Brown (London, 1907), contains a good deal of information . Paul Schultze-Naumburg, Die Technik der Malerei (Leipzig, no date) ; Vibert, La Science de la peinture (Paris, 189o), may also be mentioned .