D.C.L. OXFORD, AND LL.D. CAMBRIDGE;
LATE VICE-CHANCELLOR OF THE UNIVERSITY OF LONDON;
PRESIDENT OF UNIVERSITY COLLEGE, LONDON;
AND FOREIGN MEMBER OF THE INSTITUTE OF FRANCE.

EDITED BY

ALEXANDER BAIN, LL.D.,

PROFESSOR OF LOGIC IN THE UNIVERSITY OF ABERDEEN,
AND

G. CROOM ROBERTSON, M.A.,

PROFESSOR OF PHILOSOPHY OF MIND AND LOGIC IN UNIVERSITY COLLEGE, LONDON.

SECOND EDITION, WITH ADDITIONS.

LONDON: JOHN MURRAY, ALBEMARLE STREET.
1880.

The right of Translation is reserved.

PRINTED BY WILLIAM CLOWES AND SONS,
LONDON:
STAMFORD STREET AND CHARING CROSS.