Note 29 — LETTER IN REPLY TO HAZLITT CONCERNING THE MALTHUSIAN DOCTRINE OF POPULATION.

'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.