98 How to Win Every Argument
conclusions about things we have no evidence on, and commit a
fallacy by doing so.
There is another version of illicit process which is harder to
spot:
All cyclists are economical people, and no farmers are cyclists, so no
farmers are economical people.
(This appears to fit the observed facts, but there is a fallacy. We could
just as easily have said 'All cyclists are mortals'. This would give the
distinct impression that big fat farmers would be driving their big fat
cars for ever.)The source of the fallacy in this example is that the premise tells
us that cyclists are some of the class of economical people. The
conclusion, on the other hand, tells us that the entire class has
not a single farmer in it. Again, the fallacy is illicit process.
These terms which cover the whole of their class are called
'distributed terms', and there is a rule for finding them. Uni-
versal, which talk about 'all' or 'none', have distributed subjects;
negatives, which tell us what is not the case, have distributed
predicates. In the example above, the term 'economical people'
is distributed in the conclusion, since it is the predicate of a
negative statement. In the premise, however, it is undistributed,
being neither the subject of a universal nor the predicate of a
negative. It sounds complicated, but the rule makes it simple.
You will soon be seeing which conclusions try to cover all of a
class without any information to justify it. To dazzle your friends
totally, you should call the fallacy illicit minor when the subject of
the conclusion is unjustifiably distributed, and illicit major when
the predicate of the conclusion is so treated.
To use illicit process requires a good deal of homework. You
should deploy it in support of conclusions which look plausible
but have the minor technical drawback that you cannot prove