This work on scientific pedagogy comes in 2 volumes. The first volume entitled “Spontaneous Activity In Education” begins with a survey of the inner and outer life of the child, and emphasizes the importance of the prepared environment in education. The second volume is entitled “The Montessori Elementary Materials.” The 2 volumes discuss the application of the Montessori principles in the education of older children, between 7 and 11 years of age.