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 for the most part, the education for the learned professions, ought not properly to be considered as being paid from revenue rather than from capital. Practically they seem to be so considered. But in whatever light we view the expenditure upon these services, which are not realized upon any material products, it must be allowed that the great source of what is peculiarly called profits, and the great mass of what is usually called wealth, is directly derived from the employment of material capital in the maintenance of what Adam Smith has called productive labour. In speaking therefore, and treating of capital, it seems highly useful to have some term for the kind of labour which it generally employs, in contradistinction to the kind of labour which in general is employed directly by revenue, in order to explain the nature of productive labour, and its peculiar efficiency in causing the increase of wealth.

Secondly, it is stated by Adam Smith, that the produce which is annually saved is as regularly consumed, as that which is annually spent, but that it is consumed by a different set of people. If this be the case, and if saving be allowed to be the immediate cause of the increase of capital, it must be desirable in all questions relating to the progress of wealth, to distinguish by some particular title a set of people who appear to act so important a part in accelerating this progress. Almost all the lower classes of people of every society are employed in some way or other, and if there were no grounds of distinction in their employments with reference to their effects on the national wealth, it is difficult to conceive what would be the use of saving from revenue to add to capital, as it would be merely employing one set of people in preference to another. How in such a case are we to explain the nature of saving, and the different effects of parsimony and extravagance upon the national capital? No political economist of the present day can by saving mean mere hoarding; and beyond this contracted and inefficient proceeding, no use of the