works inEnglish are convenient introductions to the prohems andmethods of historical research: Charles V. Langlois andCharles Seignobos, Introduction to the rludy of history, NewYork, 1898; John M. Vincent, Historical research, an outlineof theory and practice, New York, 1911; and, to a morelimited extent, Fred M. Fling, Writing of history, an intro-duction to historical method, New Haven, 1920. The studentwho is specializing in history should early familiarize him-self with these volumes and then acquaint himself with otherworks in the field, notably Ernst Bernheim, hehrbuch derhistorwehen Methode und der Beschichtsplrilosophie, 6th ed.,Leipzig, 1908