The Arabic numerals make their first appearance in Europe in
manuscripts of the tenth century. Mr. G. F. Hill treats the queatiou of their subsequent changes of form in a study upon The Development of Arabi. Numerals in Europe Ex- hibited in Sixty four Tables (Oxford University Press, 7s. 6d. net). The difficult question of the ultimate origin of the numerals is not discussed; but their European history up to the sixteenth century is veep clearly shown in Mr. Hill's thousand classified examples.