The public are, in general, very ready to adopt the opinion, that he who has pleased them in one peculiar mode of composition, is, by means of that very talent, rendered incapable of venturing upon other subjects.

The effect of this disinclination, on the part of the public, towards the artificers of their pleasures, when they attempt to enlarge their means of amusing, may be seen in the censures usually passed by vulgar criticism upon actors or artists who venture to change the character of their efforts, that, in so doing, they may enlarge the scale of their art.
There is some justice in this opinion, as there always is in such as attain general currency.

It may often happen on the stage, that an actor, by possessing in a preeminent degree the external qualities necessary to give effect to comedy, may be deprived of the right to aspire to tragic excellence; and in painting or literary composition, an artist or poet may be master exclusively of modes of thought, and powers of expression, which confine him to a single course of subjects.

But much more frequently the same capacity which carries a man to popularity in one department will obtain for him success in another, and that must be more particularly the case in literary composition, than either in acting or painting, because the adventurer in that department is not impeded in his exertions by any peculiarity of features, or conformation of person, proper for particular parts, or, by any peculiar mechanical habits of using the pencil, limited to a particular class of subjects.
Whether this reasoning be correct or otherwise, the present author felt, that, in confining himself to subjects purely Scottish, he was not only likely to weary out the indulgence of his readers, but also greatly to limit his own power of affording them pleasure.

In a highly polished country, where so much genius is monthly employed in catering for public amusement, a fresh topic, such as he had himself had the happiness to light upon, is the untasted spring of the desert;-- "Men bless their stars and call it luxury." But when men and horses, cattle, camels, and dromedaries, have poached the spring into mud, it becomes loathsome to those who at first drank of it with rapture; and he who had the merit of discovering it, if he would preserve his reputation with the tribe, must display his talent by a fresh discovery of untasted fountains.
If the author, who finds himself limited to a particular class of subjects, endeavours to sustain his reputation by striving to add a novelty of attraction to themes of the same character which have been formerly successful under his management, there are manifest reasons why, after a certain point, he is likely to fail.