Under the word MORESQUE we find in Webster the following definition: "A species of painting or carving done after the Moorish manner, consisting of _grotesque_ pieces and compartments _promiscuously interspersed_; arabesque. _Gwilt_." (The Italics are our own.) We have not Mr. Gwilt's Encyclopaedia at hand; but if this be a fair representation of one of its definitions, it is a very untrustworthy authority. The last term to be applied to arabesque-work is _grotesque_, or _promiscuously interspersed_; and the description here given leaves out the most beautiful kind of arabesque, namely, the inlaid work of geometrical figures in colored marbles, in which the Arabs far surpassed the older _opus Alexandrinum_. Nothing could be less grotesque, less promiscuously interspersed, or more beautiful in its harmonious variety, than the work of this kind in the famous _Capella Reale_ at Palermo. Dr. Webster defines NIGHT-PIECE as "a piece of painting so colored as to be supposed seen by candle-light,"--a description which we suspect would have somewhat puzzled Gherardo della Notte. We might give other instances, had we time and space; but our object is not to depreciate Webster, but only to show that the claim set up for him of superior exactness in definition is altogether gratuitous. We have found no inaccuracies comparable with these in Dr. Worcester's Dictionary, which we tried in precisely the same way, by opening it here and there at random. Moreover, looking at his work, not absolutely, but in comparison with Dr. Webster's, (as we are challenged to do,) we cannot leave out of view that the former is a first edition, while the latter has had the advantage of repeated revisions. Under the word MAGDALEN, we find Webster superior to Worcester. Under ULAN, we find them both wrong. Dr. Worcester says it means "a species of militia among the modern Tartars"; and Dr. Webster, "a certain description of militia among the modern Tartars." In any Polish dictionary they would have found the word defined as meaning "lancer," and the Uhlans in the Austrian army can hardly be described as modern Tartar militia. Both Dictionaries give SLAW, and neither explains it rightly. The word does not properly belong in an English dictionary, unless as an American provincialism of very narrow range. As such, it will be found, properly defined, in Mr. Bartlett's excellent Vocabulary. Lexicographers who so often cite the Dutch equivalents of English words should own Dutch dictionaries. Under IMAGINATION, a good kind of test-word, we find Worcester much superior to Webster, especially in illustrative citations.