1. Evolutionary Biology and Ideology: Then and Now
2. abbreviated version in Ed., The Social Impact of Modem Biology, London: Routledge & Kegan Paul, 1971, pp. 199–214.
3. “The historiographic and ideological contexts of the nineteenth century debate on man's place in nature,” in and , Eds., Changing Perspectives in the History of Science, London: Heinemann, 1973. pp. 343–438.