where he came into closest touch with the development of Islam in the farthest East. He has laid down many of his conclusions in his comprehensive work on the Achehnese (De Atjehers, Leiden, 1903–1904; English translation, London, 1906). His scholarly lectures on the origins of Islam, given before various American university audiences in the spring of 1914, will long be remembered for the cool judgment and the careful poise they evinced. In the periodical publications of learned societies he has contributed numerous essays which easily place him in the very forefront of authorities on the subject which he has made his own.
The study which is here presented to the English-reading public appeared originally in the Dutch periodical De Gids, 1915, No. 1, under the title "Heilige Oorlog Made in Germany." It has been ably translated by Professor Joseph E. Gillet
