1. Among the various roles that Nietzsche assigned to his concept of will to power, one stood out early on. From Thus Spoke Zarathustra onwards, will to power was at times proposed as the drive or set of drives explaining the totality of man" behaviour, at other times as the process underpinning all organic events to the extent that the phenomena "ife" and "will to power" are said to be indistinguishable. In this context it is unsurprising to read Nietzsche treating will to power as the true basis of psychology, a discipline he redefined, in terms equally obscure and intriguing, as the exploration of "epths' and as the "orphology and evolutionary theory of the will to power". On these premises and on these alone, affirmed Nietzsche, psychology is to be recognised as "he queen of sciences, which the other sciences exist to serve and antici- pate", for it is to "once again become the way to basic issues".¹