Cell Expansion: Past, Present and Perspectives -- Solute and Water Relations of Growing Plant Cells -- Cellulose and Cell Elongation -- Hemicelluloses and Cell Expansion -- Roles of the XTH Protein Family in the Expanding Cell -- Expansins -- Pectic Polysaccharides and Expanding Cell Walls -- Redox and Wall-Restructuring -- Mechanics of the Expanding Cell Wall -- The Cytoskeleton and Co-Ordination of Directional Expansion in a Multicellular Context -- The Control of Cell Size and Rate of Elongation in the Arabidopsis Root -- Signal Crosstalk in the Control of Hypocotyl Elongation in Arabidopsis.