Phæd. I am satisfied, X. But Philebus seems perplexed. Make all clear, therefore, by demonstrating the same result in some other way. With your adroitness, it can cost you no trouble to treat us with a little display of dialectical skirmishing. Show us a specimen of manoeuvring; enfilade him; take him in front and rear; and do it rapidly, and with a light-horseman's elegance.
X. If you wish for variations, it is easy to give them. In the first argument, what I depended on was this—that the valuation was inaccurate. Now, then, secondly, suppose the valuation to be accurate, in this case we must still disallow it to Mr. Malthus; for, in columns five and six, he values by the quantity of producing labor; but that is the Ricardian principle of valuation, which is the very principle that he writes to overthrow.
Phæd. This may seem a good quoad hominem argument. Yet surely any man may use the principle of his antagonist, in order to extort a particular result from it? X. He may; but in that case will the result be true, or will it not be true?
Phæd. If he denies the principle, he is bound to think the result not true; and he uses it as a reductio ad absurdum.
X. Right; but now in this case Mr. Malthus presents the result as a truth.
Phil. Yes, X.; but observe, the result is the direct contradiction of Mr. Ricardo's result. The quantities of column first vary in value by column the last; but the result, in Mr. Ricardo's hands, is—that they do not vary in value.
X. Still, if in Mr. Malthus' hands the principle is made to yield a truth, then at any rate the principle is itself true; and all that will be proved against Mr. Ricardo is, that he applied a sound principle unskilfully. But Mr. Malthus writes a book to prove that the principle is not sound.
Phæd. Yes, and to substitute another.
X. True; which other, I go on thirdly to say, is actually employed in this table. On which account it is fair to say that Mr. Malthus is a third time refuted. For, if two inconsistent principles of valuation be employed, then the table will be vicious, because heteronymous.
Phil. Negatur minor.