an intellectual reflex of puzzlement about the situation,
his resource of common knowledge about the world is impelled to seize
on an approximate Rule,

(Rule)   B =&gt; A,   &quot;just Before it rains, the Air is cool&quot;.     

This Rule can be recognized as having a potential relevance to
the situation because it matches the surprising Fact, C =&gt; A,
in its consequential feature A.  All of this suggests that the
present Case may be one in which it is just about to rain,

(Case)   C =&gt; B,   &quot;t