extra_), and as long as we understood those propositions in the same sense, no variety was possible except in the expression and manner of our answers; and to that extent a variety exists. Any other must have arisen from our understanding that proposition in a different sense. [Footnote 29: 'Where the error must lie'--_i. e._ to furnish a sufficient answer _ad hominem_: otherwise it will be seen that I do not regard either of the two propositions as essential to Mr. Malthus's theory: and therefore to overthrow those propositions is not to answer that theory. But still, if an author will insist on representing something as essential to his theory which is not so, and challenges opposition to it,--it is allowable to meet him on his own ground.] My answer to Mr. Hazlitt therefore is--that in substance I think his claim valid; and though it is most true that I was not aware of any claim prior to my own, I now formally forego any claim on my own part to the credit of whatsoever kind which shall ever arise from the two objections to Mr. Malthus's logic in his _Essay on Population_. In saying this, however, and acknowledging therefore a coincidence with Mr. Hazlitt in those two arguments, I must be understood to mean a coincidence only in what really belongs to them; meantime Mr. Hazlitt has used two expressions in his letter to yourself which seem to connect with those propositions other opinions from which I dissent: that I may not therefore be supposed to extend my acquiescence in Mr. Hazlitt's views to these points, I add two short notes upon them: which however I have detached from this letter--as forming no proper part of its business.--Believe me, my dear Sir, your faithful humble servant. X.Y.Z.