82 MALARIA 



and squirrels, were obtained through the courtesy of the U. S. Public 

 Health Service of Washington. A habitat group shows a typical 

 family of ground squirrels on a rocky hillside in central California, 

 during the breeding season in May. Preventive measures used against 

 the plague are illustrated by models of a farm with buildings rat-proofed, 

 of a rat-killing squad, equipped for work in San Francisco, of a ship at 

 dock with rat-guards to prevent the access of rats to the shore, and by 

 specimens of various ty pes of rat traps. 



THE FLEA 



One of the enlarged models made by the late Ignaz Matausch from his original 

 studies and now shown in a case devoted to Insect Carriers of Disease, in the Hall 

 of Public Health. 



In a window case are shown various stages of the common mosquito, 

 Culex, as well as of Anopheles, the carrier of malaria, and Aedes, which 

 is responsible for the spread of j-ellow fever. In the same case are 

 specimens of other insect carriers, such as the flea, the bedbug and the louse. 



A wall case devoted to the natural history of the mosquito illustrates 

 the world distribution and seasonal prevalence of malaria and yellow 

 Malaria and fever in relation to the habits of their mosquito hosts, the 

 Yellow Fever breeding-places of mosquitoes, the life history (shown by 

 specimens) and the money cost of malaria to the United States. Here 

 are also shown some of the practical methods of control by ditching, 

 oiling, stocking with fish, and encouraging enemies such as the bat, 

 bite cures, and repellents and finally the practical results in the reduction 

 of malaria which have been obtained in Italy. 



A second mosquito case contains a series of small-scale models, 

 attractively worked out by Otto Block, illustrating some of the methods 



