_X_. Mr. Malthus represents Adam Smith as not having sufficiently explained himself on the subject. "He does not make it quite clear," says Mr. Malthus, "whether he adopts for his principle of value the quantity of the producing labor or its value." But this is a most erroneous representation. There is not a chapter in the "Wealth of Nations" in which it is not made redundantly clear that Adam Smith adopts both laws as mere varieties of expression for one and the same law. This being so, how could he possibly make an election between two things which he constantly confounded and regarded as identical? The truth is, Adam Smith's attention was never directed to the question: he suspected no distinction; no man of his day, or before his day, had ever suspected it; none of the French or Italian writers on Political Economy had ever suspected it; indeed, none of them have suspected it to this hour. One single writer before Mr. Ricardo has insisted on the _quantity_ of labor as the true ground of value; and, what is very singular, at a period when Political Economy was in the rudest state, namely, in the early part of Charles II's reign. This writer was Sir William Petty, a man who would have greatly advanced the science if he had been properly seconded by his age. In a remarkable passage, too long for quotation, he has expressed the law of value with a Ricardian accuracy: but it is scarcely possible that even he was aware of his own accuracy; for, though he has asserted that the reason why any two articles exchange for each other (as so much corn of Europe, suppose, for so much silver of Peru) is because the same quantity of labor has been employed on their production; and, though he has certainly not vitiated the purity of this principle by the usual heteronomy (if you will allow me a learned word),--that is, by the introduction of the other and opposite law derived from the _value_ of this labor,-- yet, it is probable that in thus abstaining he was guided by mere accident, and not by any conscious purpose of contradistinguishing the one law from the other; because, had _that_ been his purpose, he would hardly have contented himself with forbearing to affirm, but would formally have denied the false law. For it can never be sufficiently impressed upon the student's mind, that it brings him not one step nearer to the truth to say that the value of A is determined by the quantity of labor which produces it, unless by that proposition he means that it is _not_ determined by the _value_ of the labor which produces it.