interrelated, yet qualitatively distinct inves­ tigative efforts. Both are drawing on Darwinian concepts, which may explain why many people have failed to discriminate them. One is the study of the evolution of the cognitive apparatus of living organisms, which is first and foremost the province of biologists and psychologists (H. C. Plotkin, Ed. , Learning, Development, and Culture: Essays in Evolu­ tionary Epistemology, New York, Wiley, 1984), although quite a few philosophers - professional or vocational - have also felt the need to express themselves on this vast subject (F. M. Wuketits, Ed. , Conce ts and Approaches in Evolutionary Epistemology, Dordrecht Boston, Reidel, 1984). The other approach deals with the evolution of science, and has been dominated hitherto by (allegedly) 'naturalized' philosophers; no book-length survey of this literature is available at present.