From the text some passages, where the iterations seemed excessive, have been withheld, but only such as it was thought the author would himself have struck out upon revision: wherever there was evidence that revision had been made, the iterations, freely employed for emphasis, have been allowed to stand. On rare occasions, interpolations and verbal changes have been made with the view of bringing out more clearly the meaning sought to be conveyed. It is impossible to be more deeply sensible than the editors are, of the responsibility they have thus incurred; but they have been guided by their very respect for the venerable author, and they were fortunate in the many opportunities they enjoyed of learning from his own lips the cast of his views on Aristotle.[5] [Footnote 5: It is but due to the younger editor to state that the heaviest part of all the work here indicated has been done by him.--A. B.] An index has been drawn up with some care; as was needful, if meant to be of real service to the readers of so elaborate a work. It only remains to add that in printing the Greek of the notes, &c., the text of Waitz has been followed for the Organon (everywhere short of the beginning); the text of Bonitz, for the Metaphysica; and for other works of Aristotle, generally the Berlin edition. Regard was had, as far as the editors' knowledge went, to the author's own preferences in his reading. CONTENTS. CHAPTER I. LIFE OF ARISTOTLE 1 CHAPTER II. ARISTOTELIAN CANON 27 CHAPTER III. CATEGORIÆ 54 CHAPTER IV. DE INTERPRETATIONE 108 CHAPTER V. ANALYTICA PRIORA I. 139 CHAPTER VI. ANALYTICA PRIORA II. 171 CHAPTER VII. ANALYTICA POSTERIORA I. 207 CHAPTER VIII. ANALYTICA POSTERIORA II. 238 CHAPTER IX. TOPICA (I.-VIII.) 262 CHAPTER X. SOPHISTICI ELENCHI 376 CHAPTER XI. PHYSICA AND METAPHYSICA 422 CHAPTER XII. DE ANIMÂ, ETC. 446 CHAPTER XIII. ETHICA 494 CHAPTER XIV. POLITICA 539 APPENDIX. I. THE DOCTRINE OF UNIVERSALS 551 II. FIRST PRINCIPLES: A. Sir William Hamilton on Aristotle's Doctrine 565 B. Aristotle's Doctrine 573 III. METAPHYSICA: Book [Greek: G]. 583 Book [Greek: E]. 592 Book [Greek: Z]. 594 Book [Greek: Ê]. 609 Book [Greek: Th]. 613 Book [Greek: L]. 619