2. This is a special source of danger in the study of the works of dramatic poets, whose very art lies in the representation of the current opinions, habits, and foibles of their times--in holding up the mirror to their age. It is true that, if their works are to live, they must deal with subjects of more than mere passing interest; but it is also true that many, and the greatest of them, speak upon questions of eternal interest in the particular light cast upon them in their times, and it is quite possible that the truth may be entirely lost from want of power to recognize it under the disguise in which it comes. A certain motive, for instance, that is an overpowering one in a given period, subsequently appears grotesque, weak, or even powerless; the consequent action becomes incomprehensible, and the actor is contemned; and a simile that appeared most appropriate in the ears of the author's contemporaries, seems meaningless, or ridiculous, to later generations. 3. An example or two of this possibility of error, derived from works produced during the period with which it is the object of these pages to deal, will not be out of place here. A very striking illustration of the manner in which a word may mislead is afforded by the oft-quoted line: "Assume a virtue, if you have it not." By most readers the secondary, and, in the present day, almost universal, meaning of the word assume--"pretend that to be, which in reality has no existence;"--that is, in the particular case, "ape the chastity you do not in reality possess"--is understood in this sentence; and consequently Hamlet, and through him, Shakspere, stand committed to the appalling doctrine that hypocrisy in morals is to be commended and cultivated. Now, such a proposition never for an instant entered Shakspere's head. He used the word "assume" in this case in its primary and justest sense; _ad-sumo_, take to, acquire; and the context plainly shows that Hamlet meant that his mother, by self-denial, would gradually acquire that virtue in which she was so conspicuously wanting. Yet, for lack of a little knowledge of the history of the word employed, the other monstrous gloss has received almost universal and applauding acceptance. 4. This is a fair example of the style of error which a reader unacquainted with the history of the changes our language has undergone may fall into. Ignorance of changes in customs and morals may cause equal or greater error.