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 I appealed in laying it down; and a frequent appeal to this sort of experience is pre-eminently necessary in most of the subjects of political economy, where various and complicated causes are often in operation, the presence of which can only be ascertained in this way. A theory may appear to be correct, and may really be correct under given premises; it may further appear that these premises are the same as those under which the theory is about to be applied; but a difference which might before have been unobserved, may shew itself in the difference of the results from those which were expected; and the theory may justly be considered as failing, whether this failure arises from an original error in its formation, or from its general inapplicability, or specific misapplication, to actual circumstances.

Where unforeseen causes may possibly be in operation, and the causes that are foreseen are liable to great variations in their strength and efficacy, an accurate yet comprehensive attention to facts is necessary, both to prevent the multiplication of erroneous theories, and to confirm and sanction those that are just.

The science of political economy is essentially practical, and applicable to the common business of human life. There are few branches of human knowledge where false views may do more harm, or just views more good. I cannot agree, therefore, with a writer in one of our most popular critical journals, who considers the subjects of population, bullion, and corn laws in the same light as the scholastic questions of the middle ages, and puts marks of admiration to them expressive of his utter astonishment that such perishable stuff should engage any portion of the public attention.

In the very practical science of political economy perhaps it might be difficult to mention three subjects more practical than those unfortunately selected for a comparison with scholastic questions. But in fact, most of the subjects which belong to it are peculiarly