PA should be considered in the differential diagnosis for all dogs with difficulty walking.

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The industrial waste land in Mortagne‐du‐Nord (France) has been the site of a zinc smelter unit and a lead smelter unit linked to sulphuric acid production. It has been systematically explored by drillings and pits. Geophysical data have led to the location of mineralized soil and water, and to the identification of water seepage towards the river drain. Various geophysical devices are used for subsurface exploration and for studies with higher spatial resolution. The prospect area covers a surface of 4.5 ha. Data obtained from trenches has been used to calibrate and to validate the geophysical interpretation. It has been found that variations in the depth of the interface between resistive and conductive layers are due to two types of waste: ‘non‐active’ (carbonates and oxides) and ‘active’ (sulphides and sulphates) materials. Lower resistivities than expected are due to the presence of mineralized water in all geological formations.

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Jean-Pierre Jaffré et Jacques David. A Genetic Analysis of Number in French This paper is devoted to the cognitive operations which underlie the acquisition of number in French orthography. To better understand some of the particuliarities of this linguistic category, a genetic approach is derived from the study of the problems children are confronted with, when they try to learn it. Two main aspects are analyzed: the construction of a "plural protosign" through an interface between linguistic and extralinguistic factors, and its morphosyntactic actualisation, with graphic agreements.