Experimental Reason and Constructivism

An experiment presents a controlled environment, the events of which are contrived.  Thus, those events are pre-planned, and involve entities insofar as they appear in the context, not insofar as they may be in themselves.  In other words, Experimental Reason entails a Constructivist theory of Knowledge.  In contrast, it is a weaker version of that relation that is represented in the Preface to the B edition of the 1st Critique, i. e. there, Kant characterizes his Constructivist system merely as the one with which he just happens to experiment.