Of these missionary records, by far the most complete and the most valuable is the work of Bishop Pallegoix (published in French in the year 1854), entitled "Description du Royaume Thai ou Siam." The long residence of the excellent Bishop in the country of which he wrote, and in which, not many years afterward (in 1862) he died, sincerely lamented and honored, fitted him to speak with intelligent authority; and his book was of especial value at the time when it was published, because the Western Powers were engaged that very year in the successful attempt to renew and to enlarge their treaties with Siam. To Bishop Pallegoix the English envoy, Sir John Bowring, is largely indebted, as he does not fail to confess, for a knowledge of the history, manners, and customs of the realm, which helped to make the work of his embassy more easy, and also for much of the material which gives the work of Bowring himself ("The Kingdom and People of Siam," London, 1857) its value.
Since Sir John Bowring's time the interior of Siam has been largely explored, and especially by one adventurous traveller, Henry Mouhot, who lost his life in the jungles of Laos while engaged in his work of exploration. With him begins our real knowledge of the interior of Siam, and its partly dependent neighbors Laos and Cambodia. The scientific results of his travel are unfortunately not presented in such orderly completeness as would have been given to them had Mouhot lived to arrange and to supplement the details of his fragmentary and outlined journal. But notwithstanding these necessary defects, Mouhot's book deserves a high place, as giving the most adventurous exploration of a country which appears more interesting the more and better it is known. The great ruins of Angkor (or Angeor) Wat, for example, near the boundary which separates Siam from Cambodia, were by him for the first time examined, measured, and reported with some approach to scientific exactness.
Among more recent and easily accessible works on the country, from some of which we have borrowed, may be mentioned, F. Vincent's, "Land of the White Elephant," 1874, A. Gréhan's, "Royaume de Siam," fourth edition, Paris, 1878, "Siam and Laos, as seen by our American Missionaries," Philadelphia, 1884, Carl Bock's "Temples and Elephants," London, 1884, A. R. Colquhoun's, "Among the Shans," 1885, L. de Carné's, "Travels in Indo-China, etc.," 1872, Miss M. L. Cort's, "Siam, or the Heart of Farther India," 1886, and John Anderson's, "English Intercourse with Siam," 1890. The most authoritative map of Siam is that published in the "Proceedings of the Royal Geographical Society," London, 1888, by Mr. J. McCarthy, Superintendent of Surveys in Siam.