On Wednesday evening, September 19, instructor Jim Baker will introduce the tools, techniques and safety precautions necessary for Saturdayâ€™s hands-on, outdoor working session, both sessions taking place at Tower Hill Botanic Garden, 11 French Drive in Boylston, Massachusetts. Using diagrams and outline designs, Baker will explain the building process. A slide presentation will illustrate a variety of stone walls in different stages of construction. On Saturday, dress for work and weather, bringing work gloves, bottled water, and a bag lunch. Call 508-869-6111 to register. Tower Hill member price $54, non-member price $60.