J. B. S. Haldane, in attempting to show connections between Marxist political theory and Darwinian evolutionary theory, blurs the generic characteristics of political and scientific discourse. Read from the perspective of Bakhtin, this blurring of genres is also a blurring of ideologies. Haldane's essays thus contribute to our understanding of the cultural dimensions of scientific activities and accordingly help re‐define concepts of genre in scientific writing.