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Nor is it here to be overlooked that the adherents of this doctrine, who have found a pleasure in displaying their ingenuity in assigning the ends of things, have introduced a new species of argument, not the reductio ad impossible, but the reductio ad ignorantiam, to prove their position, which shows that it had no other method of defense left.

And yet, 'tis strange, he had never read Cicero, nor Quintilian de Oratore, nor Isocrates, nor Aristotle, nor Longinus, amongst the antients; nor Vossius, nor Skioppius, nor Ramus, nor Farnaby, amongst the moderns; and what is more astonishing, he had never in his whole life the least light or spark of subtilty struck into his mind, by one single lecture upon Crackenthorp or Burgersdicius or any Dutch logician or commentator; he knew not so much as in what the difference of an argument ad ignorantiam, and an argument ad hominem consisted; so that I well remember, when he went up along with me to enter my name at Jesus College in..., it was a matter of just wonder with my worthy tutor, and two or three fellows of that learned society, that a man who knew not so much as the names of his tools, should be able to work after that fashion with them.

No longer ago than yesterday, in one of the most widely circulated papers of this city, there was published an assertion that the mortality in several Homoeopathic Hospitals was not quite five in a hundred, whereas, in what are called by the writer Allopathic Hospitals, it is said to be eleven in a hundred. An honest man should be ashamed of such an argumentum ad ignorantiam.

As a question of dialectics, it must be admitted that this sort of reasoning is not very formidable to those who are not to be frightened by consequences. It is an 'argumentum ad ignorantiam' take this explanation or be ignorant. But suppose we prefer to admit our ignorance rather than adopt a hypothesis at variance with all the teachings of Nature?

As a question of dialectics, it must be admitted that this sort of reasoning is not very formidable to those who are not to be frightened by consequences. It is an argumentum ad ignorantiam take this explanation or be ignorant. But suppose we prefer to admit our ignorance rather than adopt a hypothesis at variance with all the teachings of Nature?

Hence Christ came with signs and wonders; that is, the absolute, or the anterior to cause and effect, manifested itself as a 'phenomenon' in time, but with the predicates of eternity; and this is the only possible definition of a miracle 'in re ipsa', and not merely 'ad hominem', or 'ad ignorantiam'. Ib. p. 177.