In his last chapter, entitled “The Intellectual Series,” M. de Roberty continues his criticism of the views of Comte as to the law of the evolution of philosophy. He shows that, so far from this being the most general law of intellectual evolution, and therefore the supreme law of all social phenomena, philosophy is only one of three intermediate terms, the others being art and industry, by the aid of which the evolution of scientific ideas acts on the ensemble of the social evolution. The intellectual evolution is the direct consequence of the social fact, but the social evolution is subject to the laws of intellectual evolution, which embrace four great classes of conceptions, answering to the four well recognised groups of facts known as science, philosophy, art, and industry. We have here the same series of special evolutions as those supposed by Comte, with the important change, however, marked by the inversion of the first two members of the series. In this relation, the author affirms that Comte’s law of the three states is false so far as concerns the evolution of the sciences, and is of very secondary importance as regards the evolution of philosophy and the two succeeding evolutions. The author concludes his work with a criticism intended to show that the principal defects of Comte’s system arise from the confusion previously insisted on in relation to the first terms of the intellectual series, science and philosophy. That confusion is exhibited in the statement that among the ancients philosophy was developed before science and art. M. de Roberty, moreover, declares Comte’s theory that the industrial development is the point of departure of modern civilisation, leads to a complete subversion of the logical and historical. Instead of the useful or the proper being, as that theory would require, the foundation of the good and this, in its turn, the germ of the true, the true is the foundation of the beautiful, and of the good and the useful. But the true is more complex than supposed by Comte. It possesses at least two aspects, science and philosophy, which may be really distinguished, although the line which separates them is yet undetermined.