ly world the physical sciences have brought to light.
A fourth source of materials, which is but another vein of this scientific quarry, is the historical and literary investigation of the Bible. This has not been so recently opened as is commonly supposed, but has been worked at intervals throughout the history of the Church, and notably at the Protestant Reformation. Luther carefully reexamined the books of the Bible, and declared that it was a matter of indifference to him whether Moses was the author of the Pentateuch, pronounced the Books of the Chronicles less accurate historically than the Books of the Kings, considered the present form of the books of Isaiah, Jeremiah and Hosea probably due to later hands, and distinguished in the New Testament "chief books" from those of less moment. Calvin, too, discussed the authorship of some of the books, and suggested Barnabas as the writer of the Epistle to the Hebrews. But the Nineteenth Century