1. Hagia Theotokos. From Dehio and Bezold 11 2. Aachen. From Dehio and Bezold 11 3. Dome of Pisa 12 4. Dome of Arnolfo 13 5. Section of the Baptistery of Florence 14 6. Dissection of the vault of the Baptistery 15 7. System of the dome of Florence 17 8. Section of the dome of Florence. From Sgrilli 18 9. Part plan of the dome of Florence. From Sgrilli 18 10. Plan of the chapel of the Pazzi 26 11. Section of the vault of the Pazzi chapel 27 12. Interior of the Pazzi chapel 28 13. Façade of the Pazzi chapel 30 14. Badia of Fiesole 32 15. Impost of San Lorenzo 33 16. Crossing pier of San Lorenzo 34 17. Façade of Santa Maria Novella 36 18. Plan of Sant’ Andrea, Mantua 39 19. Façade of Sant’ Andrea, Mantua 40 20. Arch of Septimius Severus 41 21. Temple of Vesta, Tivoli. From Serlio 45 22. San Pietro in Montorio. From Serlio 46 23. Bramante’s dome for St. Peter’s. From Serlio 48 24. Section of the Pantheon. From Fontana 50 25. Plan of Bramante’s dome. From Serlio 51 26. Michael Angelo’s model for the dome of St. Peter’s 54 27. Diagrams of vault construction 56 28. Interior of dome of Salamanca 57 29. Diagrams of vault construction 58 30. Dome of St. Peter’s. From the Report of the Mathematicians 61 31. Plan of St. Peter’s. From Fontana 67 32. Section of aisle of St. Peter’s. From Fontana and Letarouilly 69 33. Pier of Sant’ Agostino 72 34. Façade of Sant’ Agostino 73 35. Exterior of Todi 75 36. Interior of Todi 76 37. Plan of San Biagio 77 38. Interior of San Biagio 78 39. Arcade. From Serlio 79 40. Exterior of San Biagio 80 41.