Most of the letters in this volume were written by Theodore Roosevelt to his children during a period of more than a dozen years. A few others are included that he wrote to friends or relatives about the children. He began to write to them in their early childhood, and continued to do so regularly till they reached maturity. Whenever he was separated from them, in the Spanish War, or on a hunting trip, or because they were at school, he sent them these messages of constant thought and love, for they were never for a moment out of his mind and heart. - Introduction.