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As the efficacy of human industry, in increasing the quantity

either of wool or of raw hides, is limited, so far as it depends

upon the produce of the country where it is exerted; so it is

uncertain so far as it depends upon the produce of other

countries. It so far depends not so much upon the quantity which

they produce, as upon that which they do not manufacture; and

upon the restraints which they may or may not think proper to

impose upon the exportation of this sort of rude produce. These

circumstances, as they are altogether independent of domestic

industry, so they necessarily render the efficacy of its efforts

more or less uncertain. In multiplying this sort of rude produce,

therefore, the efficacy of human industry is not only limited,

but uncertain.