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41 Hypocaust for Heating Water, Thermæ of Caracalla 57 42 Restoration of Thermæ of Titus. (Restored by Leclerc) 58 43 Plan of the Thermæ of Titus, Rome. (Restored by Leclerc) 59 44 Sectional Elevation, Thermæ of Titus, Rome 60 45 Frigidarium, Thermæ of Caracalla, Rome. (Restored by Viollet-le-Duc.) 61 46 Interior View of Aqueduct, Lisbon, Portugal 62 47 Destroyed Lead Font, Great Plumstead, Norfolk 64 48 Leaden Cup, of the time of Vespasian 65 49 Lead Pipehead and Pipe 66 50 Lead Cistern with the Arms of the Fishmongers' Company 67 51 Car of Juggernaut 68 52 Distant View of Zempoala Aqueduct, Queretaro, Mexico 70 53 Near View of Zempoala Aqueduct, Mexico 71 54 Zempoala Aqueduct. From an old print 72 55 The Oldest Bathroom in the World 76 56 Savery's Engine 77 57 Newcomen's Engine 78 58 Pump House, Philadelphia 79 59 Wooden Boilers used in Philadelphia Water Supply 80 60 Bored-out Log Pipe, used in British Columbia 81 61 Valve for Wooden Pipes used in Philadelphia Water Supply 82 62 Hydrant for Wooden Pipes used in Philadelphia Water Supply 82 63 Modern Vertical Triple-Expansion Pumping Engine 83 64 Aqueduct Crossing the Alcantara Valley 84 65 Bathing and Burning Hindu Dead at Benares 90 66 Map Showing Relation of Cholera and the Broad Street Pump 92 67 York Survey of the Broad Street Pump 101 68 The Fountain of Elisha 108 69 Map Showing Location of Cases of Cholera in Hamburg and Altona 110