This volume contains the first results from the excavation of a terp at Wijnaldum in the province of Friesland, the Netherlands. The excavation was carried out as a joint venture between the University of Groningen and the University of Amsterdam from 1991 until 1993, and was the starting point of an interdisciplinary project on Frisia Magna in the first millennium AD: a time when Frisia became an important influence on the international trade and political stage in Northwest Europe.
This volume describes Wijnaldum, how it was once a cradle of political and economic growth, and how the cultural heritage of the great days of Frisian history is now severely threatened in parts of the terp region.

In his "Geometrie" of 1637 Descartes achieved a monumental innovation of mathematical techniques by introducing what is now called analytic geometry. Yet the key question of the book was foundational rather than technical: When are geometrical objects known with such clarity and distinctness as befits the exact science of geometry? Classically, the answer was sought in procedures of geometrical construction, in particular by ruler and compass, but the introduction of new algebraic techniques made these procedures insufficient. In this detailed study, spanning essentially the period from the first printed edition of Pappus' "Collection" (1588, in Latin translation) and Descartes' death in 1650, Bos explores the current ideas about construction and geometrical exactness, noting that by the time Descartes entered the field the incursion of algebraic techniques, combined with an increasing uncertainty about the proper means of geometrical problem solving, had produced a certain impasse. He then analyses how Descartes transformed geometry by a redefinition of exactness and by a demarcation of geometry's proper subject and procedures in such a way as to incorporate the use of algebraic methods without destroying the true nature of geometry. Although mathematicians later essentially discarded Descartes' methodological convictions, his influence was profound and pervasive. Bos' insistence on the foundational aspects of the "Geometrie" provides new insights both in the genesis of Descartes' masterpiece and in its significance for the development of the conceptions of mathematical exactness.