Background controls on stone decay in polluted environments: preliminary observations from Rio de Janeiro H. Neill and B. J. Smith v Characterisation and decay of monumental sandstone in La Rioja, Northern Spain S. Pavia Santamaria et al v The weathering of Wealden sandstone churches: a preliminary analysis D. A. Robinson and R. B. G. Williams v Pore properties of limestones as controls on salt weathering susceptibility: a case study J. P. McGreevy v SECTION III - ANALYSIS AND APPLICATION v (A) Analytical Methods  v Analytical techniques for the examination of building stone J. J. McAlister v Predicting the weathering of Portland limestone buildings T. Yates and R. Butlin v The permeability testing of masonry materials J. Beggan et al v Methods for investigating stone decay mechanisms in polluted and ‘clean’ environments, Northern Ireland C. A. Moses v Errors associated with determining P and S acoustic wave velocities for rock weathering studies W. Murphy et al  v (B) Conservation Practice v English Heritage’s current building conservation research J. Fidler v A basis for evaluating the durability of new building stone A. P. Duffy and P. O’Brien v Retreatment of consolidated stone A. Nandiwada and C. A. Price v Defensive conservation: a phased strategy for protecting outdoor stone carvings in the north of Ireland M. F. Fry and A. Martin