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 . 15° 
Dysentery.155 
Diarrhea in Infants.156 
Tuberculosis ..162 
