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By Philip Grierson

In quantity 2 of this sequence, half I examines Phocas and Heraclius (602-641) and half II covers the interval among Heraclius Constantine to Theodosius III (602-717).

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Extra info for Catalogue of the Byzantine Coins in the Dumbarton Oaks Collection and in the Whittemore Collection, 2: Phocas to Theodosius III, 602-717 (Dumbarton Oaks Catalogues)

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G. Dijkstra and J. Mosk, The analysis of art through the art of analysis, Trends Anal. , 1981, 1(2), 40–44. M. Ferretti, Scientific Investigations of Works of Art, ICCROM, Rome, 1993. A. Henriques, Algumas reflexões sobre a conservação do património edificado em Portugal, in 2 ENCORE, Proceedings of the Encontro sobre Conservação, Reabilitação de Edifícios, Laboratorio Nacional de Engenharia Civil, Lisboa, 1994, 67–86. J. Koestler, Insect eradication using controlled atmospheres and FTIR measurement for insect activity, ICOM Committee for Conservation 10th Triennial Meeting, Washington, DC, 1993, 882–885.

Some papermaking fibres, especially those derived from wood, contain lignin which is a large three-dimensional polymer made of building blocks containing rings of six carbon atoms called phenyl-propanes. The structures of the phenyl-propanes in grasses and in coniferous and deciduous woods are slightly different from one another, however, Figure 2 indicates how lignin is typically constructed. Lignin is the stiffening material that gives wood its characteristic mechanical properties; it stops plants from falling over!

Furthermore, conservation relies heavily on the crafts component – a point that is being forgotten as the application of science has gained terrain in conservation. But science can never, nor should it, replace conservation. The contribution of science, with regard to conservation, is to help understand deterioration mechanisms that affect works of art and other cultural objects. This will certainly aid in diminishing their deterioration rate and assist in devising better preventive conservation approaches and better conservation methods, but the applications of these methods will still depend on the sense and sensibility of the conservator.

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