HE author Of this instructive volume is in the direct line of missionary pioneers to the Moslem world. He fol lows Raymond Lull, Henry Martyn, Ion keith-falconer, and Bishop French, and, with his friend and comrade the Rev. James Cantine, now stands in the shining line of succession at the close of a decade Of patient and brave service at that lonely outpost on the shores of the Persian Gulf. Others have followed in their footsteps, until the Arabian Mission, the adopted child of the Reformed Church in America, is at present a compact and resolute group Of men and women at the gates of Arabia, waiting on God's will, and intent first of all upon fulfilling in the spirit of Obedience to the Master the duty assigned them.