Those who know us will not, from what is here premised, suppose it our intention, to enter into any wholesale _laudation_ of “Barnaby Rudge.” In truth, our design may appear, at a cursory glance, to be very different indeed. Boccalini, in his “Advertisements from Parnassus,” tells us that a critic once presented Apollo with a severe censure upon an excellent poem. The God asked him for the beauties of the work. He replied that he only troubled himself about the errors. Apollo presented him with a sack of unwinnowed wheat, and bade him pick out all the chaff for his pains. Now we have not fully made up our minds that the God was in the right. We are not sure that the limit of critical duty is not very generally misapprehended. _Excellence_ may be considered an axiom, or a proposition which becomes self-evident just in proportion to the clearness or precision with which it is _put_. If it fairly exists, in this sense, it requires no farther elucidation. It is not excellence if it need to be demonstrated as such. To point out too particularly the beauties of a work, is to admit, tacitly, that these beauties are not wholly admirable. Regarding, then, excellence as that which is capable of self-manifestation, it but remains for the critic to show when, where, and how it fails in becoming manifest; and, in this showing, it will be the fault of the book itself if what of beauty it contains be not, at least, placed in the fairest light. In a word, we may assume, notwithstanding a vast deal of pitiable cant upon this topic, that in pointing out frankly the errors of a work, we do nearly all that is critically necessary in displaying its merits. In teaching what perfection _is_, how, in fact, shall we more rationally proceed than in specifying what it _is not_?