viii 



Contents 



CHAPTER VII 



PAGE 



Mosquitoes and Malaria 106 



Early reference to malaria, 106; its general distribution, 106; 

 theories in regard to its cause, 107; insects early suspected, 107; 

 The parasite that causes malaria, 108; studies of the parasite, 

 108; Life-history in human host, 109; its effect on the host, no; 

 the search for the sexual generation, in; The parasite in the 

 mosquito, 112; review of whole life-history, 115; malaria trans- 

 mitted only by mosquitoes, 115; Summary, 117; experimental 

 proof, 118. 



CHAPTER VIII 



Mosquitoes and Yellow Fever 120 



A disease of tropical or semi-tropical countries, 120; out- 

 breaks in the United States, 120; parasite that causes the dis- 

 ease not known, 121; formerly regarded as a contagious dis- 

 ease, 122; The yellow fever commission, 123; Dr. Finlay's 

 claim, 124; experiments made by the commission, 125; sum- 

 mary of results, 129; what it means, 130; results in Havana, 

 131; the fight in New Orleans, 132; In the Panama canal zone, 

 135; in Rio de Janiero, 136; claims of the French commission, 

 138; habits of stegomyia, 139; breeding habits, 139; possible 

 results of war against the mosquitoes, 139; Danger of this dis- 

 ease in the Pacific Islands, 140. 



CHAPTER IX 



Fleas and Plague 142 



Great scourges, 142; the "black death," 142; old conditions 

 and new, 143; How plague was controlled in San Francisco, 

 143; Indian Plague commission, 144; Dr. Simond's claim, 

 145; The advisory committee and the new commission, 146; 

 Results of Dr. Virjbitski's experiments, 147 ; Results of various 

 investigations, 150; structure and habits of fleas, 151; feeding 

 habits, 152; Common species of fleas, 153; Ground squirrels and 

 plague, 155; squirrel fleas, 156; Remedies for fleas, 157; cats 

 and dogs, 159. 



