DRY STONE WALLS By Gerald Schofield I think an old-fashioned dry stone wall is one of the finest and most attractive ways of retaining soil and preventing erosion on slopes and banks. Building one of these walls is a fairly simple procedure that involves putting together natural rocks using soil and artistic flair (and sometimes blood, always sweat, and on the odd  occasion, a few tears). This is my advice as to how to build a dry stone wall (and how I have gone about building them for many years now). The wall shown here is currently under construction in the garden of the editor, and will hopefully feature in The Gardener again when it is completed. Read more in the August issue of The Gardener Magazine…