 Montessori education experienced significant growth in Spain, the Netherlands, the UK and Italy.On her return from the US, Montessori continued her work in Barcelona, where a small program sponsored by the Catalan government begun in 1915 had developed into the Escola Montessori, serving children from three to ten years old, and the Laboratori i Seminari de Pedagogia, a research, training, and teaching institute.A fourth international course was given there in 1916, including materials and methods, developed over the previous five years, for teaching grammar, arithmetic, and geometry to elementary school children from six to twelve years of age.