Dr. de Sola’s wide range of studies had made him very popular both as a public lecturer and as a contributor to various literary papers. The themes of some of these were afterwards much amplified by him and republished in their elaborated and completed form. At comparatively short intervals he gave to the public his works on “Scripture Botany,” “Sinaitic Inscriptions,” “Hebrew Numismatics,” “The Ancient Hebrews as Promoters of the Arts and Sciences,” “The Rise and Progress of the Great Hebrew Colleges,” and “Philological Studies in Hebrew and the Aramaic Languages.” Turning his attention again to Jewish history, he, in 1869, wrote his interesting “Life of Shabethai Tsevi, the False Messiah.” The following year he completed his “History of the Jews of Poland,” and in 1871 he published his “History of the Jews of France.” Dr. de Sola closely identified himself with many of our literary and scientific associations, notably with the Natural History Society, in which he was an active colaborer of Sir William Dawson and Sir William Logan. He was for many years president of the society and received H. R. H. Prince Arthur (afterwards Duke of Connaught) when that prince visited the society in 1870. His address upon “The Study of Natural Science,” delivered upon that occasion, called forth a letter of approbation from Queen Victoria. During all his intense literary activity Dr. de Sola was taking a very prominent part in all matters affecting the Jewish people. His mastery of Jewish theology, in all its branches, had earned him wide renown among his own race and had gained him a high place among the very foremost rabbis of the day. Convinced that the fences which orthodoxy placed around the citadel of his ancestral faith were the best safeguards against disintegrating forces, the upholders of historical Judaism found in him an able and powerful champion. Equally noticeable were his bold attacks upon the weak points of the skeptical school of modern biblical criticism. His intimate knowledge of all those branches of learning which bear upon this subject made him particularly formidable in this respect. The Jewish press and pulpit and the lecture platform were the vehicles by which he usually reached the public on these subjects. He had, indeed, since his first arrival in Canada been a particularly active contributor to Jewish journals, more especially to the Occident of Philadelphia, with which he was for years identified, being in intimate literary relations with its editor, the gifted Isaac Leeser.