158 MALARIA 



state, have more than one third of all the deaths from 

 malaria. 



"If the counties bordering the Sacramento and San 

 Joaquin Valleys and sending tributary streams to these 

 two great rivers be divided by a line from the Suisun 

 Bay to Mokelumne Peak, it will be found that eleven 

 counties to the north of this line show 50 per cent of 

 the deaths from malaria in 1909, and thirteen counties 

 to the south of the line show 30 per cent of the deaths 

 from this cause. In other words, the Sacramento and 

 San Joaquin Valleys contributed 80 per cent of all the 

 deaths from malaria within these valleys. The follow- 

 ing figures are significant : Nine of the twenty-four 

 counties had 75 per cent of the deaths, or 60.6 per cent 

 of the deaths for the entire state. These nine counties 

 fall into three groups : (1) Placer, Sacramento, San 

 Joaquin, with 25 per cent of the deaths and a popu- 

 lation of 136,774; (2) Butte, Tehama, Shasta, with 

 24 per cent of deaths and a population of 57,622 ; 

 (3) Fresno, Tulare, Kern, with 11.6 per cent deaths and 

 148,812 population. 



"Reducing these figures to terms of 100,000 popula- 

 tion and comparing with the United States census 

 average of 4.8 for the entire registration area, the 

 Buttc-Tehama-Shasta area shows 46.8 deaths per 

 100,000 population ; the Placer-Sacramento-San Joa- 

 quin area shows 20.4 deaths per 100,000; and 

 the F res no-Tula re- Kern area shows 8.9 deaths per 

 100,000 population. These figures are not given to 



