The Idea of a Category Mistake: From Ryle to Habermas,and Beyond

Summary

The term ‘category mistake’ began to turn up regularly in public discourse in the 1990s as a general term to describe a confusion between different fields of thought with serious practical consequences. But it began its career in philosophy, introduced by Gilbert Ryle in The Concept of Mind in 1949 to attack Cartesian dualism and assert a monistic solution to the so-called mind-body problem. This paper traces the stages by which it came into general usage, arguing that while by the later 1960s it had generally been rejected by philosophers, it was saved from disappearance by its migration into fields such as psychology and theology. From there, it moved into critical theory and then into international relations. Its entry into these latter areas first made plain its potential in political argument. Eventually, multiple meanings of the term came to coexist with one another, with the practical and rhetorical usage supplementing rather than replacing its original philosophical sense.     

Leonardo Bruni and humanist historiography

Leonardo Bruni: History of the Florentine People. Edited by James Hankins, Volume 1 (Cambridge, MA: Harvard University Press, 2001 and 2004), v–xxiv?+?520 pp. $29.95/£19.95/€27.70 cloth.

Leonardo Bruni: History of the Florentine People. Edited by James Hankins, Volume 2 (Cambridge, MA: Harvard University Press, 2004), xiii?+?584 pp. $29.95/£19.95/€27.70 cloth.     

Archaeology,assistance, and aggression along the Euphrates: reflections from Raqqa

ABSTRACT

This paper traces the cultural missions and salvage archaeology programs along the Euphrates River around Raqqa from the 1950s onwards. We suggest that the varied investments from international expeditions, conservation programs, and technical assistance in Syria have an important, untold history that is relevant to recent developments and conflicts in northern Syria. We explore the intersecting practices of archaeology and assistance, illuminated by archives drawn from international agencies such as UNESCO, as well as companies, consultants, bureaucrats, and archaeologists. Our focus is upon foreign intervention around imperiled heritage, considering not only internal politics but also UNESCO’s 1960s shift from fully funded campaigns to global appeals reliant on foreign governments, corporations, and universities. The outsourcing of salvage allowed specific patrons – national and international – to privilege particular pasts; and it is these histories and legacies that further require us to reassess the place of Raqqa in the current civil war.     

Assessing the applicability of portable X-ray fluorescence spectrometry for obsidian provenance research in the Maya lowlands

Recent innovations in portable energy-dispersive X-ray fluorescence (PXRF) spectrometry have increased its utility for the geochemical characterization of obsidian artifacts for archaeological provenance research. However, concerns over the utility of PXRF instrumental analyses have been raised, focused on the validity and reliability of the geochemical data produced. Here we adopt the framework of Richard Hughes (On Reliability, Validity, and Scale in Obsidian Sourcing Research, 1998), whereby reliability addresses instrument stability and issues of measurement while validity pertains to an instrument’s ability to discern geochemical source provenance. This is done in order to test the utility of PXRF instruments for archaeological provenance research. k-Means cluster analysis was used to test the accuracy of PXRF through statistical comparison of data acquired via laboratory and portable energy-dispersive XRF instruments. Multivariate analysis was employed to demonstrate obsidian source representation at two Classic Maya archaeological sites in southern Belize – Uxbenká and Ek Xux – and to test the validity of data obtained from a PXRF instrument in answering archaeological research questions pertaining to regional interactions between lowland Maya polities. Results suggest that portable XRF instruments produce internally consistent results. However, data acquired from a PXRF instrument are not statistically equivalent to other XRF instruments. This is to say that while PXRF is not a reliable technique, it is valid for questions pertaining to geochemical source representation.     

Luminescence characteristics and dose distributions for quartz and feldspar grains from Mumba rockshelter,Tanzania

Mumba rockshelter is a key archaeological site for the Middle and Later Stone Age occupation of East Africa, but its chronology has remained unresolved. We report the results of a dating study, focussing on the characterisation of the optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL) properties of quartz- and potassium-rich feldspar grains. Quartz has previously proven troublesome for dating in East Africa. We identified five general types of quartz grain behaviour, based on the shapes of their OSL decay and dose–response curves. Dose recovery experiments and measurement of the natural samples revealed particular problems with quartz grains that had hyperbolic dose–response curves, low characteristic saturation doses and anomalously large changes in sensitivity between regenerative-dose cycles. The use of pulsed irradiation during measurement and standard and additional quality-assurance criteria during data analysis reduced the number of grains that suffered from these problems. We applied these procedures to individual grains of quartz from eight samples and, using appropriate statistical models, identified post-depositional mixing in three samples. The remaining samples had scattered equivalent-dose distributions typical of quartz grains that had received variable beta dose rates during burial. Stratigraphically consistent OSL ages were obtained for all but the deepest sample. Feldspar ages were estimated for the latter sample and three other samples, using the elevated temperature IRSL signal that exhibited low rates of anomalous fading. Fading-corrected feldspar ages for the latter three samples are consistent with their single-grain quartz ages, but single-grain dating is needed to address problems of post-depositional mixing.