Excerpt from Lectures on Logic, Vol. 2

Gentlemen, - We concluded, in our last Lecture, the consideration of Syllogisms, viewed as Incorrect or False; in other words, the doctrine of Fallacies, in so far as the fallacy lies within a single syllogism. This, however, you will notice, does not exhaust the consideration of fallacy in general, for there are various species of false reasoning which may affect a whole train of syllogisms. These, - of which the Petitio Principii, the Ignoratio Elenchi, the Circulus, and the Saltus in Concludendo, are the principal, - will be appropriately considered in the sequel, when we come to treat of the Doctrine of Probation or Demonstration.

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