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For example, in ''Utilitarianism'', John Stuart Mill tries to prove that the one desirable thing is pleasure.  'The only proof capable of being given that an object is ''visible'' is that people actually see it.  The only proof that a sound is ''audible'', is that people hear it: and so of the other sources of our experience. In like manner, I apprehend, the sole evidence it is possible to produce that anything is ''desirable'', is that people do actually desire it'.

For example, in ''Utilitarianism'', John Stuart Mill tries to prove that the one desirable thing is pleasure.  'The only proof capable of being given that an object is ''visible'' is that people actually see it.  The only proof that a sound is ''audible'', is that people hear it: and so of the other sources of our experience. In like manner, I apprehend, the sole evidence it is possible to produce that anything is ''desirable'', is that people do actually desire it'.

However, the inflexion '-ible' has a different semantic analysis in the premisses than in the conclusion.  ''Visible'' and ''audible'' mean what ''can'' be seen or heard: the inflexion implies mere possibility.  But ''desirable'' means that a thing ''ought'' to be desired, or that it is intrinsically valuable or worthwhile.  Taken properly, the argument proves only that people ''can'' desire pleasure, not that they ''ought' to.

However, the inflexion '-ible' has a different semantic analysis in the premisses than in the conclusion.  ''Visible'' and ''audible'' mean what ''can'' be seen or heard: the inflexion implies mere possibility.  But ''desirable'' means that a thing ''ought'' to be desired, or that it is intrinsically valuable or worthwhile.  Taken properly, the argument proves only that people ''can'' desire pleasure, not that they ''ought'' to.

== Fallacies ''extra dictionem'' ==

== Fallacies ''extra dictionem'' ==