The third volume of letters to Pestalozzi covers the years 1810 to 1813 and contains over 600 letters. They show how Pestalozzi's methods awakened interest in the different countries of Europe (Prussia, Russia, Italy, England). They also give insight into the first large crises within the organization of the Institute and show how high the demand was for places for pupils and for teacher training places, both from Switzerland and from other countries. In addition, staff members who were close to Pestalozzi report in long letters about their experiences with the method in foreign countries.