 In accordance with step (3), the argument contra is rejected on the grounds that it is a fallacy, because in the sentence it starts off with, ‘Every animal but man is irrational,’ the expression ‘man’ has simple supposition, that is, it stands for man in general, whereas in the second sentence, ‘Therefore every animal but this man is irrational,’ the expression ‘this man’ has personal supposition, that is, it stands for an individual man. A second mistake in the disproof is that it proceeds from a combination of something less general with the distributive sign ‘every’ to a combination of something that is more general with the distributive sign ‘every’: in the first sentence, ‘every animal’ ranges over every animal other than man, whereas in the second sentence, the expression ‘every animal’ comprehends not only all the animals, but also every man other than this one.