Comment les Monades Conduisent Au Scepticisme

Wolff’s review of Leibniz’metaphysics is discussed in the correspondence between Voltaire and Frederick, the future Frederick II. Frederick attempts to introduce and to convert Voltaire to Wolffianism. Even though he declares it remarkable, Voltaire has little esteem for the Wolffian method. Rejecting Baylian fideism, Frederick is unwilling to renounce voluntarily the knowledge that can be acquired through reasoning. According to Voltaire, metaphysical truths remain inaccessible. The only defensible position is hence that of metaphysical scepticism. Frederick acknowledges this: having studied the sciences and observed the spirit of men, the inclination towards scepticism is natural. Hence, the debate on monads has led Frederick to renounce his previous Wolffianism. He is ready to become the perfect despot, pragmatic and realistic, a follower of the French Enlightenment.     

Hard core and cutting edge: experimental manufacture and use of Magdalenian composite projectile tips

The technology of the European Upper Palaeolithic yielded abundant evidence of the use of composite projectile heads, in the form of osseous points on the side of which one or several (micro)lithic elements are attached. Yet, little experimental work has been devoted to testing and assessing the parameters of use of this type of composite tips. In this paper we present a pilot experiment with replicas of Magdalenian composite spear tips, made of an antler point with one or two rows of flint backed bladelets. Two series of replicas were manufactured after the lithic and osseous record of, respectively, the Lower Magdalenian from southwest France (c. 20–18 Ky cal BP) and the Upper Magdalenian of Pincevent in the Paris Basin (c. 15–14 Ky cal BP). The 34 experimental composite heads were hafted to spears that were then shot with a spearthrower at the carcasses of two young deer. The results provide some insight into the performance characteristics of the osseous and lithic components, both in efficiency and durability. Finally, possible improvements of the experimental protocol are discussed, as well as the implications of our results for the understanding of projectile point variability in the Upper Palaeolithic.     

Hunting lesions caused by osseous projectile points: experimental results and archaeological implications

The identification of projectile impact traces on archaeological faunal remains is an important issue for understanding prehistoric hunting behavior, especially in the Paleolithic and Mesolithic. From the beginning of the Upper Paleolithic in Europe, and earlier in Africa, projectiles tipped with osseous points were of great importance for subsistence; but thus far, no specific experimental reference has been developed to help identify the traces left by these points. In 2003 and 2004 two series of projectile experiments with antler points of Magdalenian design were organized, involving two ox calves and two female fallow deer as targets for bow and spearthrower shooting. The subsequent study demonstrates that positive identifications of impact traces left by osseous points can be made. The observation of 127 impact traces allowed us to distinguish three main types of traces: notches, punctures and perforations. The relationships between the nature of the impact traces and the (i) target species, (ii) characteristics of the impacted bones, and (iii) type of weapon are presented. Synthesized results are then discussed within the context of the European Upper Paleolithic and Mesolithic.     

The Toulouse Cluster of On-board Systems: A Process of Collective Innovation and Learning

Analysis by product or by type of activity is becoming less and less pertinent when characterizing the production organization of industrial clusters and local productive systems. In numerous regions and metropolitan areas, the way that economic activities are based geographically reveals relationships which go across different sectors of activity, on the basis of the similarity of skills required. At Toulouse, on-board systems, mainly sets of equipment composed of electronic and computer components integrated into an aircraft, a satellite or an automobile, were first developed on a sectorial basis before becoming progressively the subject of transverse skills and knowledge between the different industrial sectors (aeronautics, space, automobile electronics). Today this system is tending to consolidate on the basis of positive externalities such as the sharing of common subcontracting of information technology services, the collaboration of industrial firms with engineering science institutions, the circulation of personnel within the local labour market. To this must be added a strong institutional input which is manifested by the addition of an “on-board systems” section to the Competitive Cluster “Aeronautics and Space” common to the Midi-Pyrenees and Aquitaine regions. In the case of Toulouse, the “on-board systems” activities form the basis of a local organization of these high-technology activities into a local skills system.