On such a man the historical method can have no grip. There is, as the French say, no _engrenage_. It points to a certain lack of the subtler kind of understanding to attempt to apply the method; more truly, perhaps, to an unessential interest, which has of late years been imported into French criticism from Germany. The Sorbonne has not, we know, gone unscathed by the disease of documentation for documentation's sake. M. Masson's three volumes leave us with the sense that their author had learnt a method and in his zeal to apply it had lost sight of the momentous question whether Jean-Jacques was a person to whom it might be applied with a prospect of discovery. No one who read Rousseau with a mind free of ulterior motives could have any doubt on the matter. Jean-Jacques is categorical on the point. The Savoyard Vicar was speaking for Jean-Jacques to posterity when he began his profession of faith with the words:-- 'Je ne veux argumenter avec vous, ni même de tenter vous convaincre; il me suffit de vous exposer ce que je pense dans la simplicité de mon coeur. Consultez le vôtre pendant mon discours; c'est tout ce que je vous demande.' To the extent, therefore, that M. Masson did not respond to this appeal and filled his volumes with information concerning the books Jean-Jacques might have read and a hundred other interesting but only partly relevant things, he did the citizen of Geneva a wrong. The ulterior motive is there, and the faint taste of a thesis in the most modern manner. But the method is saved by the perception which, though it sometimes lacks the perfect keenness of complete understanding, is exquisite enough to suggest the answer to the questions it does not satisfy. Though the environment is lavish the man is not lost.