had a real
| effect in producing the prediction.  In the third place, every
| representation addresses itself to a mind.  It is only in so
| far as it does this that it is a representation.  The idea of
| the representation itself excites in the mind another idea and
| in order that it may do this it is necessary that some principle
| of association between the two ideas should already be established
| in that mind.  These three conditions serve to define the nature of
| a representation.
|
| C.S. Peirce, C