Considers in detail the means for treating marine waterlogged wood; discusses the following: impregnation and bulking; historical development of treatments for waterlogged wood; development of polyethylene glycol methods; the use of sugars; in situ polymerization; impregnation with a wax or resin using a non-aqueous solvent and drying from a non-aqueous solvent; silicates and siliceous materials (alum, teos); comparisons between methods and guidelines for their selection; practical conservation methods (impregnation tank construction; design of freeze dryers; slow drying and conditioning; cleaning waterlogged wood; consolidation of treated wood gluing and repairing waterlogged wood, surface coating, test methods, special problem with large items such as ship hulls).