These ten years of quiet, unflinching service have been full of prayer, observation, study, and wistful survey of the great task, while at the same time every opportunity has been improved to gain a foothold, to plant a standard, to overcome a prejudice, to sow a seed, and to win a soul. The fruits of this intelligent and conscientious effort to grasp the situation and plan the campaign are given to us in this valuable study of “Arabia, the Cradle of Islam.” It is a missionary contribution to our knowledge of the world. The author is entirely familiar with the literature of his subject. English, German, French, and Dutch authorities are at his command. The less accessible Arabic authors are easily within his reach, and he brings from those mysterious gardens of spices into his clear, straightforward narrative, the local coloring and fragrance, as well as the indisputable witness of original medieval sources. The ethnological, geographical, archaeological, commercial, and political information of the descriptive chapters brings to our hands a valuable and readable summary of facts, in a form which is highly useful, and will be sure to quicken an intelligent interest in one of the great religious and international problems of our times. His study of Islam is from the missionary standpoint, but this does not necessarily mean that it is unfair, or unhistorical, or lacking in scholarly acumen. Purely scientific and academic study of an ethnic religion is one method of approaching it. It can thus be classified, labelled, and put upon the shelf in the historical museum of the world’s religions, and the result has a value which none will dispute. This, however, is not the only, or indeed the most serviceable, way of examining, estimating and passing a final judgment upon a religious system. Such study must be comparative, it must have some standard of value; it must not discard acknowledged tests of excellence; it must make use of certain measurements of capacity and power; it must be pursued in the light of practical ethics, and be in harmony with the great fundamental laws of religious experience and spiritual progress which have controlled thus far the regenerative processes of human development.