[6] "Relatives are known only together: the science of contraries is one. Subject and object, mind and matter, are known only in correlation and contrast, and in the same common act: which knowledge is at once a synthesis and an antithesis of both, and may be indifferently defined an antithetic synthesis and a synthetic antithesis of the terms. Every conception of _self_ necessarily implies a conception of _not self_; every perception of what is different from me, implies a recognition of the percipient subject in contradistinction from the object perceived. In one object of knowledge, indeed, the object is the prominent element, in another the subject; but there is none in which either is known out of relation to the other. The immediate knowledge which Reid allows of things different from the mind, and the immediate knowledge of mind itself, cannot, therefore, be split into two distinct acts. In perception, as in other faculties, the same indivisible consciousness is conversant about both terms of the relation of knowledge."--_Edinburgh Review_, No. 103, p. 165.--A very able and elaborate paper, attributed to Sir William Hamilton. [7] _Lewes' Biographical History of Philosophy._ Vol. iv., p. 209. In every way a remarkable work. Written with great vivacity and clearness, comprising a world of matter in the briefest possible space,--and, O reader, and O author, forgive the anticlimax!--at the least possible cost. In fact it forms part of the Series known as "_Knight's Weekly Volume_." To find a strictly original work of so much ability given to the world in this form, proves that the publisher and the man of letters are, in this mercantile age, second to none in the activity and enterprise with which they render _their_ service to the public. CHARLES DE BERNARD.