vi CONTENTS 



CHAPTER II 



PAGE 



THE NATURAL ENEMIES OF THE TYPHOID FLY . 62 



Fungous Diseases 62 



Protozoan Enemies of the House Fly . . 70 



Nematode Parasites of the Typhoid Fly . . 72 



The Mite Enemies of Musca Domestica . . 75 



Spiders as Fly Enemies 78 



False Scorpions on Flies 80 



The House Centipede 82 



Insect Enemies of the House Fly .... 84 



Predatory Enemies 84 



Parasitic Enemies 88 



Vertebrate House Fly Enemies 95 



Fly-Catching Rats 97 



CHAPTER III 



THE CARRIAGE OF DISEASE BY FLIES .... 100 



Exact Experiments 102 



Typhoid or Enteric Fever 112 



Suspicions of the Carriage of Typhoid by 



Flies 114 



Inferential Proof 116 



Exact Proof 125 



Chronic Carriers 128 



Influence of Flies in the Carriage of Typhoid 



in Cities 138 



Other Points .148 



Cholera 150 



Dysentery 155 



Diarrhea in Infants 156 



Tuberculosis 162 



