Are produced by the same Causes 10 Foul Air—Overcrowding 12 Attack Animals 7, 13, 16, 65, 110 Their Attendant Signs—Meteorology 17 Action of Air on the Blood 19 Theories of Epidemic Causes 23 Influence of Climate 25 Mortality within the Tropics 29 Their Relation to Civilization 33 State of England in the 14th Century 35 Improvements in the 15th Century 41 Prolongation of Life in the 17th and 45 18th Centuries Disappearance of the Earlier Epidemics, 51 _e.g._ Jail Fever, Sweating Sickness, Plague, Typhus-Gravior, &c. Experience of the Model Dwellings 54 Sanitary Legislation and Works 57, 129 Epidemics are within Human Control 58 QUARANTINE— Originated in the Belief that Epidemics 61 spread exclusively by Contagion Sanitary Measures the only Safeguards 63 Effects Attributed to Contagion 67 Inutility of Quarantine 71 Plague, Yellow Fever, Cholera, &c. 73 Mitigation of Disease by Migration, 75 _e.g._ Tramps Sanitary Regulation of Ships 77 CONTAGION— Cholera averted at Baltimore 79 Cholera averted at Newcastle Barracks 82 Yellow Fever in the _Eclair_ 84 Alleged Communication of Disease to Boa 96 Vista, and Examination of Evidence Alleged Importation of Disease by the 117 _Dygden_ into Gibraltar, and Examination of Evidence APPENDIX. Sanitary Works accomplished under the 129 Public Health Act ------------------------------------------------------------------------ THE COMMON NATURE OF EPIDEMICS. ------------------