We have in Mr Irving Babbitt's _Rousseau and Romanticism_ to deal with a closely argued and copiously documented indictment of the modern mind. We gather that this book is but the latest of several books in which the author has gradually developed his theme, and we regret exceedingly that the preceding volumes have not fallen into our hands, because whatever may be our final attitude towards the author's conclusions, we cannot but regard _Rousseau and Romanticism_ as masterly. Its style is, we admit, at times rather harsh and crabbed, but the critical thought which animates it is of a kind so rare that we are almost impelled to declare that it is the only book of modern criticism which can be compared for clarity and depth of thought with Mr Santayana's _Three Philosophical Poets_. By endeavouring to explain the justice of that verdict we shall more easily give an indication of the nature and scope of Professor Babbitt's achievement. We think that it would be easy to show that in the last generation--we will go no further back for the moment, though our author's arraignment reaches at least a century earlier--criticism has imperceptibly given way to a different activity which we may call appreciation. The emphasis has been laid upon the uniqueness of the individual, and the unconscious or avowed aim of the modern 'critic' has been to persuade us to understand, to sympathise with and in the last resort to enter into the whole psychological process which culminated in the artistic creation of the author examined. And there modern criticism has stopped. There has been no indication that it was aware of the necessity of going further. Many influences went to shape the general conviction that mere presentation was the final function of criticism, but perhaps the chief of these was the curious contagion of a scientific terminology. The word 'objectivity' had a great vogue; it was felt that the spiritual world was analogous to the physical; the critic was faced, like the man of science, with a mass of hard, irreducible facts, and his function was, like the scientist's, that of recording them as compendiously as possible and without prejudice. The unconscious programme was, indeed, impossible of fulfilment. All facts may be of equal interest to the scientist, but they are not to the literary critic. He chose those which interested him most for the exercise of his talent for demonstration. But that choice was, as a general rule, the only specifically critical act which he performed, and, since it was usually unmotived, it was difficult to attach even to that more than a 'scientific' importance. Reasoned judgments of value were rigorously eschewed, and even though we may presume that the modern critic is at times vexed by the problem why (or whether) one work of art is better than another, when each seems perfectly expressive of the artist's intention, the preoccupation is seldom betrayed in the language of his appreciation.