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This article reconstructs the trajectory of the Kwame Nkrumah Ideological Institute (KNII) to shed light on the politics of socialist education in 1960s Ghana. On the basis of archival evidence, it explores the changing role of the institute in the making of Nkrumahism as public discourse and documents the evolving relationship between the universalism of Marxism-Leninism and the quest for more local political iconographies centred on Nkrumah's life and work. Secondly, the article analyses the individual motivations and experiences of a sample of foreign lecturers. The article suggests that ideological institutes offer insights into the processes by which official ideologies were created and disseminated, a foil through which to interrogate the usages and appropriation of social sciences education, and a window onto the multiple ways in which local and foreign agents negotiated their identities and political participation in African socialist experiments.

The article reconstructs the methodological trajectory of Polly Hill. Crossing the boundaries between economics and anthropology, Hill's work was simultaneously an epistemic challenge to development economics, and a testimony to the complexity and richness of economic life in what she called the 'rural tropical world'. Drawing inspiration from the processes that Mary Morgan referred to as 'seeking parts, looking for wholes', the paper explores the evolving relationship between observational practice and conceptual categories in Hill's work on West Africa and India. It is argued that fieldwork, the central element in Hill's methodological reflection, served two main functions. Firstly, it acted as the cornerstone of her views on observation and induction, framing her understanding of the relationship between 'parts' and 'wholes'. Secondly, Hill used fieldwork as a narrative trope to articulate her hopeful vision for an integration of economics and anthropology, and later express her feelings of distance and alienation from the ways in which these disciplines were actually practised.

The alfalfa caterpillar, Colias lesbia (Fabricius) (Lepidoptera: Pieridae), is a major pest of alfalfa, Medicago sativa L. (Fabales: Fabaceae), crops in Argentina. Its management is based mainly on chemical control of larvae whenever the larvae exceed the action threshold. To develop and validate fixed-precision sequential sampling plans, an intensive sampling programme for C. lesbia eggs was carried out in two alfalfa plots located in the Province of Córdoba, Argentina, from 1999 to 2002. Using Resampling for Validation of Sampling Plans software, 12 additional independent data sets were used to validate the sequential sampling plan with precision levels of 0.10 and 0.25 (SE/mean), respectively. For a range of mean densities of 0.10 to 8.35 eggs/sample, an average sample size of only 27 and 26 sample units was required to achieve a desired precision level of 0.25 for the sampling plans of Green and Kuno, respectively. As the precision level was increased to 0.10, average sample size increased to 161 and 157 sample units for the sampling plans of Green and Kuno, respectively. We recommend using Green's sequential sampling plan because it is less sensitive to changes in egg density. These sampling plans are a valuable tool for researchers to study population dynamics and to evaluate integrated pest management strategies.

The article uses the first population census of postcolonial Ghana to analyze the relationship between statistics and the process of imagining the nation-state. In contrast with much historical and sociological literature, which conceptualizes the relationship between census-taking and state formation in terms of identification, classification, and quantification, the departure point of this analysis is the importance of gaining the trust of the counted subjects. In Ghana, where the possibility of obtaining accurate population returns had been severely hindered by people's distrust in the state, the 1960 population census saw the organization of a capillary education campaign in schools and in the press. By dissecting the iconographies emerging from the Census Education and Enlightenment Campaign, the article makes three contributions. First, it shows that understanding the concrete ways in which statistics inform political imagination requires an expansion of the field of observation beyond the statistical machinery and other “centers of calculation.” Second, complementing James Ferguson's understanding of “development discourse” as an “anti-politics machine,” it is argued that the possibility of making the people of Ghana “census minded” depended on the construction of a much richer set of inherently political representations about the nature of the postcolonial state. Finally, it shows the importance of critically interrogating the political implications acquired by the reception of global statistical practices. It does so by documenting the multiple ways in which the international standards promoted by the United Nations became entwined with the transformation of Ghanaian politics through the mobilization of children and press propaganda.