The only official documents which deal with the origins of the war and are known at the present time are the reports from the Ambassadors of the various Powers to their respective Governments. They form the subject-matter of several publications which are called the Blue Book, Yellow Book, White Book, and so forth, 1 and have a good deal 178of psychological importance, especially as showing how sentimental and mystic impulses surpass rational ones, and how easily governments may be led to act in opposition to their own wishes.