there has been formed a treasury of subtle observations and precise rules, suggested by experience, which are something more than mere common sense. And, admitting the existence of those who, without having ever learnt to reason, always reason well, by a gift of nature, it would be easy to set against these exceptions innumerable cases in which ignorance of logic, the use of irrational methods, want of reflection on the conditions of historical analysis and synthesis, have robbed the work of specialists and historians of much of its value.
The truth is, that, of all branches of study, history is without a doubt the one in which it is most necessary for students to have a clear consciousness of the methods they use. The reason is, that in history instinctive methods are, as we cannot too often repeat, irrational methods; some preparation is therefore required to counteract the first impulse. Besides, the rational methods of obtaining historical knowledge differ so widely from the methods of all other sciences, that some perception of their distinctive features is necessary to avoid the temptation of applying to history the methods of those sciences which have already been systematised. This explains why mathematicians and chemists can, more easily than historians, dispense with an "introduction" to their subject. There is no need to insist at greater length on the utility of historical methodology, for there is evidently nothing very serious in the attacks which have been made on it. But it behooves us to explain the reasons which have led to the composition of the present work. For the last fifty years a great number of intelligent and open-minded men have meditated on the methods of the historical sciences. Naturally we find among them many historians, university professors, whose position enables them to understand better than others the intellectual needs of the young; but at the same time professed logicians, and even novelists. In this connection, Fustel de Coulanges left a tradition behind him at the University of Paris. "He endeavoured," we are told, "to reduce the rules of method to very precise formulæ ...; in his view no task was more urgent than that of teaching students how to