In an Appendix I have inserted the Chinese tales translated by the author during his residence in Siam--some unfinished papers which are only specimens of a zoological work which my brother intended to publish--the descriptions of the principal entomological and conchological specimens discovered by him, and which are now deposited in the Museums of London and Paris--the Cambodian vocabulary, a proof of his industry, of the variety of his knowledge, and of the care with which he collected everything which might be useful to his successors in the difficult path which he opened to them. Lastly, I have collected the letters of my brother to his family and other correspondents, together with some letters addressed to him, a few of which were never even received, while others only reached their destination after his death, or remained in the hands of friends who were charged to deliver them. This correspondence tends, I think, to display my brother’s character, the delicacy of his mind, and the goodness of his heart, qualities which have been recognised by so many, both during his life and after his death. The engravings from his drawings will impart interest to the descriptions of the ruins and vast buildings which he discovered in the interior of Siam and Cambodia, testifying to an advanced state of civilization in former times, and which, I venture to think, deserve to be brought into notice. They will also familiarize the reader with the manners, customs, and appearance of the country. My aim has been to be useful to those who deign to read these pages; and, if fidelity be merit in a book, I trust the reader will be satisfied. Even should there be any errors in the numbers of the population, and similar details concerning the little-known countries which my brother traversed, I beg the reader to view them with indulgence, bearing in mind that most of this journal was written in pencil, sent home from a long distance, and some of it half effaced;--illegible, indeed, to any one to whom his writing was not as well known as it was to Madame Mouhot and myself, and who were not as intimate with the heart and thoughts of the writer. All these reasons induce me to reckon on the indulgence of the public. The Memoir which follows was written by a friend in Holland. The historical notice which I have thus introduced, appeared to me useful, in order to give a clearer idea of the country which my brother has contributed to make better known, and where he sealed with his death his devotion to travel and scientific pursuits.