I trust it will not be thought superfluous to attempt a definition of what we ought to look for in judging dramatic literature. Dryden, whose example cannot well be followed too closely in criticism, acknowledges the need for a definition of a play early in his _Essay of Dramatic Poesy_. Lisideius, one of the interlocutors in the conversation, gives this, with the proviso that it is rather a description than a definition: “A just and lively image of human nature, representing its passions and humours, and the changes of fortune to which it is subject, for the delight and instruction of mankind.” Now this is neither definition nor description of a play. There is not a word in it which does not apply to _Gil Blas_. Dryden was himself well aware of its insufficiency, for he makes Crites raise “a logical objection against it”--that it is “only a _genere et fine_, and so not altogether perfect.” Yet he leaves the matter standing there. That he, who was himself a playwright, should have been content to do this when dealing with the drama is one proof how much English literature had lost “the sense of the theatre.” If Lisideius had not been thinking of literature, but of literature as adapted to the stage, he would have said (but in Dryden’s incomparably better way) something like this: “A play is an action, put before an audience by dialogue and representation, forming a coherent whole, in which all the parts subserve a general purpose, and are dramatically good only in so far as they do.” Lyric beauty, good moral reflection, vigorous deliveries of human nature, are, however good in themselves, as little able to make a good play as the most beautiful ornament is to make a fine building. [SN: _Classic, Spanish, and French drama._] It is the unity of the action which constitutes the good play, and it may be obtained by different methods. A dramatist may obtain unity by means of the passion or by the working out of a single situation. Of the great Greek dramatists I cannot speak with expert authority, but as far as they are visible in translations as in a glass darkly, they appear to have achieved unity in this way to the full. The chorus, which in inferior hands offers irresistible temptations for wandering talk, always carries on the action, while what we see is the outward and visible sign of some terrible force working behind. This ever-present sense of the something reserved driving before it what we are allowed to see, with an undeviating directness of aim, gives by itself an awful unity of interest to the tragedy. The Spanish dramatist gains his unity by artful construction of his story, and by subordinating passion and character to the mere action. The French stage in its great days aimed at using the same resources as the Greek, though with certain mechanical changes, such as the dropping of the chorus, and the division of its work among the personages, which in itself was no great gain. [SN: _Unity of the English play._]