or again in the form

Either A or B is C,

which is equivalent to saying

Either A is C or B is C.

216. As the double nomenclature may cause some confusion, a scheme
is appended.

Proposition
____________|_____________
| |
Simple Complex
(Categorical) (Conditional)
___________|__________
| |
Conjunctive Disjunctive.
(Hypothetical)

217. The first set of names is preferable. 'Categorical' properly
means 'predicable' and 'hypothetical' is a mere synonym for
'conditional.'

218. Let us examine now what is the real nature of the statement
which is made in the complex form of proposition. When, for instance,
we say 'If the sky falls, we shall catch larks,' what is it that we
really mean to assert? Not that the sky will fall, and not that we