THE ORIGIN,DESTRUCTION AND RESTORATION OF COLOUR IN EGYPTIAN TRAVERTINE*

Travertine was one of ancient Egypt's most popular ornamental stones. Upon prolonged exposure to sunlight, the rock's translucent brownish calcite is bleached to nearly white. Ultraviolet and gamma irradiation experiments were undertaken to investigate the source of the brownish colour and the process by which it fades. It was found that the coloration results from the activation of colour centres by natural radioactivity within the rock, and that these colour centres are deactivated by the ultraviolet component of sunlight. The results also demonstrate that the original brownish colour of sun‐bleached, travertine objects can be restored by artificial gamma irradiation.     

1. THE DEFINING CHARACTER OF CHINESE HISTORICAL THINKING1

Imbued with profound historical consciousness, the Chinese people are Homo historiens in every sense of the term. To be human in China, to a very large extent, is to be historical, which means to live up to the paradigmatic past. Therefore, historical thinking in traditional China is moral thinking. The Chinese historico‐moral thinking centers around the notion of Dao, a notion that connotes both Heavenly principle and human norm. In view of its practical orientation, Chinese historical thinking is, on the one hand, concrete thinking and, on the other, analogical thinking. Thinking concretely and analogically, the Chinese people are able to communicate with the past and to extrapolate meanings from history. In this way, historical experience in China becomes a library in which modern readers may engage in creative dialogues with the past.     

Unofficial Road Building in the Amazon: Socioeconomic and Biophysical Explanations

Roads have manifold social and environmental impacts, including regional development, social conflicts and habitat fragmentation. ‘Road ecology’ has emerged as an approach to evaluate the various ecological and hydrological impacts of roads. This article aims to complement road ecology by examining the socio‐spatial processes of road building itself. Focusing on the Brazilian Amazon, a heavily‐studied context due to forest fragmentation by roads, the authors consider non‐state social actors who build ‘unofficial roads’ for the purpose of gaining access to natural resources to support livelihoods and community development. They examine four case studies of roads with distinct histories in order to explain the socio‐spatial processes behind road building in terms of profit maximization, land tenure claims, co‐operative and conflictive political ecologies, and constraints as well as opportunities afforded by the biophysical environment. The study cases illustrate the need for a multi‐pronged theoretical approach to understanding road building, and call for more attention to the role of non‐state actors in road construction.     

SOME EVIDENCE THAT WOMEN ARE MORE MOBILE THAN MEN: GENDER DIFFERENCES IN U.K. GRADUATE MIGRATION BEHAVIOR

ABSTRACT.  In this paper we employ dichotomous, multinomial and conditional logit models to analyze the employment-migration behavior of some 380,000 U.K. university graduates. By controlling for a range of variables related to human capital acquisition and local economic conditions, we are able to distinguish between different types of sequential migration behavior from domicile to higher education and on to employment. Our findings indicate that U.K. female graduates are generally more migratory than male graduates. We suggest that the explanation for this result lies in the fact that migration can be used as a partial compensation mechanism for gender bias in the labor market.     

The Public Policy Process among Southeastern States: Elaborating Theories of Regional Adoption and Hold‐Out Behavior

Having been adopted by legislatures in over a dozen states, postsecondary merit aid programs are largely concentrated in the southeastern United States. The observed clustering pattern seems to support previous evidence that policies spread between proximate states, a phenomenon referred to by political scientists as policy diffusion. Often, however, policy diffusion is not complete, and one or more states in a region fail to adopt. By interviewing policymakers throughout the southeastern United States—including actors in the three states in the region without merit aid—the study addresses the following question: Why do diffusion pressures lead to adoption in some states but not in others? Studying state “hold‐outs” promises not only to uncover the reasons for failed legislation in specific state contexts but also to better our understanding of the limits of diffusion theory.     

Local Institutions and Environmental Outcomes: Evidence from Wetlands Protection in Massachusetts

Community‐based efforts to address environmental problems occupy an increasingly large space on the environmental policy landscape. Advocates argue that local environmental institutions (LEIs) can deliver both procedural and environmental quality benefits. Yet, despite over a decade of expansive support, the performance of LEIs remains largely unknown, particularly with regard to environmental outcomes. In this article, we consider new environmental outcome data we compiled from local efforts to implement the Massachusetts Wetlands Protection Act. We find that stronger forms of LEIs generate both quantitatively and qualitatively better environmental outcomes, which suggests that LEIs may live up to their advocates’ expectations.