They are not innate properties of mind corresponding to ultimate prior traits of Being, nor are they apriori categories imposed on sense in awholesale, once-for-all way, prior to experience so as to make it possible. The active power of ideas is areality, but ideas and idealisms have an operative force in concrete experienced situations j their worth has to be tested by the specified consequences of their operation. Idealism is something experimental not ab- stractly rational jit is related to experienced needs and con- cerned with projection of operations which remake the actual content of experienced objects.