Taken altogether, the two volumes are undoubtedly a most important contribution to the history of ancient thought. As regards Aristotle, the author's design must be gathered chiefly from the first eleven chapters,--begun as these were in 1865, and proceeded with in their order, till he was overtaken, in the act of composing the last, by the insidious malady which, after six months, finally carried him off. Perhaps the most striking feature in the exposition of the Organon, is the very full analysis given of the long treatise called Topica. While the other treatises have all, more or less, been drawn upon for the ordinary theory of Logic, the Topica, with its mixed logical and rhetorical bearings, has ceased to be embodied in modern schemes of discipline or study. Mr. Grote's profound interest in everything pertaining to Dialectic drew him especially to this work, as the exhibition in detail of that habit of methodized discussion so deep rooted in the Hellenic mind. And in the same connection it may be noted how the natural course of his work brought him, in the last months of his intellectual activity, to tread again old and familiar ground. A plea--this time against Aristotle--for the decried Sophists, and, once more, a picture of that **dialectical mission of Sokrates which for him had an imperishable charm, were among the very last efforts of his pen. . . . . . . . Besides making up the Second Volume from the end of Chapter XI., the editors have, throughout the whole work, bestowed much attention on the notes and references set down by the author with his usual copious minuteness. It was deemed advisable to subject these everywhere to a detailed verification; and, though the editors speak on the matter with a diffidence best understood by those who may have undergone a similar labour, it is hoped that a result not unworthy of the author has been attained. In different places additional references have been supplied, either where there was an obvious omission on the author's part, or in farther confirmation of his views given in the text: such references, mostly to the works of Aristotle himself, it has not been thought necessary to signalize. Where, as once or twice in the Appendix, a longer note in explanation seemed called for, this has been printed within square brackets.