THE TWO FACTORS IN IMAGINATION.--From the simple facts which we have
just been considering, the conclusion is plain that our power of
imagination depends on two factors; namely, (1) _the materials available
in the form of usable images capable of recall_, and (2) _our
constructive ability_, or the power to group these images into new
_wholes, the process being guided by some purpose or end_. Without this
last provision, the products of our imagination are daydreams with their
'castles in Spain,' which may be pleasing and proper enough on
occasions, but which as an habitual mode of thought are extremely
dangerous.
