in rapid succession numerous works and treatises, besides constantly lecturing before various literary and scientific associations. Of his writings and lectures at this period the principal ones were: “Scripture Botany,” “Sinaitic Inscriptions,” “Hebrew Numismatics,” “Philological Studies in Hebrew and the Aramaic Languages,” “The Ancient Hebrews as Promoters of the Arts and Sciences,” and “The Rise and Progress of the Great Hebrew Colleges.” For several years he occupied the position of President of the Natural History Society, and in that capacity he received Prince Arthur (now Duke of Connaught) when His Royal Highness visited the society in 1870. His address upon “The Study of Natural Science,” delivered before the Prince upon this occasion, called forth a letter of approbation from Queen Victoria. In 1869 Dr. de Sola completed his valuable historical work entitled, “The Life of Shabethai Tsevi, the Jewish False Messiah.” This was followed by two other important historical works: “The History of the Jews of Poland,” published in 1870, and “The History of the Jews of France,” published one year later. Ever since his arrival in Canada Dr. de Sola had been labouring zealously in every movement that tended to the advancement of the Jewish people. His eloquence as a preacher, added to his intimate knowledge of rabbinical learning, placed him among the very foremost exponents of Jewish thought of the day, and he was recognized as one of the chief leaders of the orthodox Jews of America. Broad-minded and tolerant in all things, he was at the same time strictly orthodox in his Judaism. His deep studies in the paths of science, literature and philology all tended the more to confirm him in his abiding faith in the Book of Books; hence we find that throughout his career he was constantly engaged, both in the pulpit and press, in giving battle to those who would assail the Hebrew Scriptures. Scarcely a work ever left his hands that did not contain many a well directed shaft at the infidel teachings of certain modern sceptics. In the columns of the Jewish press he was particularly active in this respect, and for many years he was a very regular contributor to various Jewish journals, particularly to the _Occident_ of Philadelphia (edited by the gifted Isaac Leeser), with which he was closely identified. He also frequently visited the United States, where his lectures invariably attracted large audiences and brought him into great prominence. In 1872 Dr. de Sola was invited by General Grant’s administration to open the United States Congress with prayer, and for the first time in history the extraordinary spectacle was witnessed of one who was not a subject of the United States nor of the dominant faith—one who was a British subject and a Jew—performing the opening ceremonies at the assembling of Congress at Washington. This high example of liberality upon the part of the government of the United