There are some facts in the physical world which have a really wonderful analogy with others in the world of thought, and seem thus to give some color of truth to the (false) rhetorical dogma, that metaphor or simile may be made to strengthen an argument, as well as to embellish a description. The principle of the _vis inertiæ_, for example, with the amount of _momentum_ proportionate with it and consequent upon it, seems to be identical in physics and metaphysics. It is not more true, in the former, that a large body is with more difficulty set in motion than a smaller one, and that its subsequent impetus is commensurate with this difficulty, than it is, in the latter, that intellects of the vaster capacity, while more forcible, more constant, and more extensive in their movements than those of inferior grade, are yet the less readily moved, and are more embarrassed and more full of hesitation in the first few steps of their progress. While, therefore, it is not impossible, as we have just said, that some slight mental aberration might have given rise to the hesitancy and indefinitiveness of purpose which are so very perceptible in the first pages of the volume before us, we are still the more willing to believe these defects the result of the moral fact just stated, since we find the work itself of an unusual order of excellence, even when regarded as the production of the author of “Nicholas Nickleby.” That the evils we complain of are not, and were not, fully perceived by Mr. Dickens himself, cannot be supposed for a moment. Had his book been published in the old way, we should have seen no traces of them whatever.