Indice: vol. 2.: Foreword; Introduction; pt. 3. Arches, domes and Vaults: 9. Knowledge and prejudice before the eighteenth century; 10. First theories about the statics of arches and domes; 11. Architectonic debates; 12. Later research; pt. 4. The theory of elastic Systems: 13. The eighteenth-century debate on the supports problem; 14. The path towards energetical principles; 15. The discovery of general methods for the calculation of elastic; 16. From the theory of elastic systems to structural engineering; Author index; Subject index