In 1836, he published, in England and in the United States, his "Elements of International Law," and in 1846 republished it in this country with numerous additions. In 1841 he wrote in French, "Histoire du Progrès du Droit des Gens depuis la paix de Westphalie," which obtained a _mention honorable_ from the French Institute. This work was published in French at Leipsic, 1844, and afterwards in New-York, under the title of "History of the Law of Nations." Competent judges have spoken of it as the best work of the kind ever written; Mr. Reddie and Mr. Manning in Great Britain, Baron Gagern in Germany, and the enlightened and accomplished Minister of the King of Sardinia, Marquis d'Azeglio, have all awarded high praise to it. By diplomatists, it is considered an invaluable book of reference; by British statesmen, it has several times been quoted in Parliament, and there can be no exaggeration in saying, that it has entitled the author to a lasting reputation in the Old World. In 1840, Mr. Wheaton had the misfortune to lose his eldest son, a lad of great promise, who died after a few days' illness in Paris, where he was at school. From that moment, all the father's hopes centred in Robert, his only remaining son. Of the latter, this is not the place to speak fully; but we cannot forbear to say, that he lived long enough to realize the fondest anticipations of his parents, and that his early death, at the age of twenty-five years, will ever be a source of regret to all who knew him. He died on the 9th of October, 1851, only three years after his father.