 Nonetheless, a traditional form of metaphysics did make a resurgence in the last quarter of the century in the work of Anderson’s student, D. M. Armstrong. Armstrong accepts against Anderson that the nature of space and time is a matter for scientific investigation, as is the identification of real properties – Anderson’s view of three-dimensional space and one-dimensional time as “ontological bed-rock”, for example, simply cannot be sustained (Armstrong, introduction to STC). But he finds real interest in Anderson’s conception of the categories, as elaborated in the lectures on Samuel Alexander, recently published as Space, Time and the Categories: Lectures on Metaphysics (STC – published from typescript lectures in Armstrong’s possession and originally presented in 1949–50). In his introduction to these lectures, Armstrong writes: