[3] See C. B. Brown and J. G. Sawkins, _Reports on the Physical, Descriptive and Economic Geology of British Guiana_ (London, 1875); C. Velain, "Esquisse geologique de la Guyane francaise et des bassins du Parou et du Yari (affluents de l'Amazone) d'apres les explorations du Dr Crevaux," _Bull. Soc. Geogr._ ser. 7, vol. vi. (Paris, 1885), pp. 453-492 (with geological map); E. Martin, _Geologische Studien uber Niederlandisch-West-Indien, auf Grund eigener Untersuchungsreisen_ (Leiden, 1888); W. Bergt, "Zur Geologie des Coppename- und Nickerietales in Surinam (Hollandisch-Guyana)," _Samml. d. Geol. Reichsmus._ (Leiden), ser. 2, Bd. ii. Heft 2, pp. 93-163 (with 3 maps); and for British Guiana, the official reports on the geology of various districts, by J. B. Harrison, C. W. Anderson, H. I. Perkins, published at Georgetown. GUIART (or GUIARD), GUILLAUME (d. c. 1316), French chronicler and poet, was probably born at Orleans, and served in the French army in Flanders in 1304. Having been disabled by a wound he began to write, lived at Arras and then in Paris, thus being able to consult the large store of manuscripts in the abbey of St Denis, including the _Grandes chroniques de France_. Afterwards he appears as a _menestrel de bouche_. Guiart's poem _Branche des royaulx lignages_, was written and then rewritten between 1304 and 1307, in honour of the French king Philip IV., and in answer to the aspersions of a Flemish poet. Comprising over 21,000 verses it deals with the history of the French kings from the time of Louis VIII.; but it is only really important for the period after 1296 and for the war in Flanders from 1301 to 1304, of which it gives a graphic account, and for which it is a high authority. It was first published by J. A. Buchon (Paris, 1828), and again in tome xxii. of the _Recueil des historiens des Gaules et de la France_ (Paris, 1865). See A. Molinier, _Les Sources de l'histoire de France_, tome iii. (Paris, 1903).