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Shell beads are well established in the archaeological record of sub-Saharan Africa and appear as early as 75,000 BP; however, most research has focused on ostrich eggshell (OES) and various marine mollusc species. Beads made from various land snails shells (LSS), frequently described as Achatina, also appear to be widespread. Yet tracking their appearance and distribution is difficult because LSS beads are often intentionally or unintentionally lumped with OES beads, there are no directly dated examples, and bead reporting in general is highly variable in the archaeological literature. Nevertheless, Achatina and other potential cases of LSS beads are present at over 80 archaeological sites in at least eight countries, spanning the early Holocene to recent past. Here, we collate published cases and report on several more. We also present a new case from Magubike Rockshelter in southern Tanzania with the first directly dated LSS beads, which we use to illustrate methods for identifying LSS as a raw material. Despite the long history of OES bead production on the continent and the abundance of land snails available throughout the Pleistocene, LSS beads appear only in the late Holocene and are almost exclusively found in Iron Age contexts. We consider possible explanations for the late adoption of land snails as a raw material for beadmaking within the larger context of environmental, economic, and social processes in Holocene Africa. By highlighting the existence of these artifacts, we hope to facilitate more in-depth research on the timing, production, and distribution of LSS beads in African prehistory.  相似文献   
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This article considers why and how locality influenced feminists' perceptions of colonised women. It does so through an analysis of how militants and novelists linked with the Union Française pour le Suffrage des Femmes (French Union for Women's Suffrage, UFSF) perceived the Arab and Berber women of colonial North Africa. The organisation had branches in North Africa, and thus feminists in Algeria, Morocco and Tunisia are compared to those in France. Where these women lived shaped their understanding of French women's roles in the colonies, along with their opinions regarding the rights to which colonised women could lay claim. Tensions among UFSF members are traced here through the literary figure Elissa Rhaïs, articles in the feminist newspaper  La Française  and correspondence among UFSF members. These sources indicate that while all these French women positioned themselves as mediators of colonialism and women's rights, their precise interpretations of that mediation were consistently influenced by local concerns.  相似文献   
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Studies of failure typically assess public policies through the lenses of effectiveness, efficiency, and performance. Here I wish to propose a further dimension to the evaluation and assessment of policy failure—legitimacy. The substantive elements of public policies and the procedural steps taken by authoritative decision makers during the policy cycle affect the perception of policy legitimacy held by both stakeholders and the public. In substantive terms, policy content should align with the dominant attitudes of the affected policy community and, ideally, the broader public. Procedurally, factors such as policy incubation, the emotive appeals deployed to gain support for an initiative, and the processes of stakeholder engagement shape the legitimacy of public policies and the governments who promote them. This argument is based on a comparison of education reform in two Canadian provinces during the 1990s. Governments in Alberta and Ontario pursued common agendas of education reform, but while Alberta achieved success, the Ontario government experienced a series of setbacks and lost the support of education stakeholders and the public. The root of Ontario's failures lies in the realm of legitimacy. These findings highlight the fact that the strategies used for enacting policy change may fail to bring about the necessary consensus among societal actors to sustain a new policy direction and calls attention to our need to better understand how governments can achieve meaningful public participation while still achieving legislative success in an efficient fashion.  相似文献   
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