Let the fact be first stated, and then examined.
_Shakespeare's_ plays are not in the rigorous and critical sense either tragedies or comedies, but compositions of a distinct kind; exhibiting the real state of sublunary nature, which partakes of good and evil, joy and sorrow, mingled with endless variety of proportion and innumerable modes of combination; and expressing the course of the world, in which the loss of one is the gain of another; in which, at the same time, the reveller is hasting to his wine, and the mourner burying his friend; in which the malignity of one is sometimes defeated by the frolick of another; and many mischiefs and many benefits are done and hindered without design.
Out of this chaos of mingled purposes and casualties the ancient poets, according to the laws which custom had prescribed, selected some the crimes of men, and some their absurdities; some the momentous vicissitudes of life, and some the lighter occurrences; some the terrours of distress, and some the gayeties of prosperity.

Thus rose the two modes of imitation, known by the names of _tragedy_ and _comedy_, compositions intended to promote different ends by contrary means, and considered as so little allied, that I do not recollect among the _Greeks_ or _Romans_ a single writer who attempted both.
_Shakespeare_ has united the powers of exciting laughter and sorrow not only in one mind, but in one composition.

Almost all his plays are divided between serious and ludicrous characters, and, in the successive evolutions of the design, sometimes produce seriousness and sorrow, and sometimes levity and laughter.
That this is a practice contrary to the rules of criticism will be readily allowed; but there is always an appeal open from criticism to nature.

The end of writing is to instruct; the end of poetry is to instruct by pleasing.

That the mingled drama may convey all the instruction of tragedy or comedy cannot be denied, because it includes both in its alterations of exhibition and approaches nearer than either to the appearance of life, by shewing how great machinations and slender designs may promote or obviate one another, and the high and the low co-operate in the general system by unavoidable concatenation.
It is objected, that by this change of scenes the passions are interrupted in their progression, and that the principal event, being not advanced by a due gradation of preparatory incidents, wants at last the power to move, which constitutes the perfection of dramatick poetry.