267 



In every case make a differential count of the 

 leucocytes and keep the record. 



Observe especially, any community of Euro- 

 peans shewing a larger percentage than usual of 

 malaria] infection. Note the conditions under 

 which these are living, and note also the probable 

 greater prevalence of blackwater fever in these 

 communities, e.g., Roman Catholic Fathers, West 

 African miners, railway communities, Europeans 

 in poor circumstances living in the slums of native 

 towns, etc., Syrian hawkers, etc. Note those 

 communities habitually taking quinine. 



Infected /'\^\ 

 Anop/ielesj\^^ J 



/ \^ 



Infected Anopheles. 

 ■■'■■""x\ 



\ 



\ ) / Infecceti 

 f-'- >•, ■■.-iy A,)0^eiei. -i. 



<^.'\. 



?^m 





/' "i 



I ijcirds. 



Large Railwiiy camp 



turopeAn quarters oa 

 Native jucu-Cera ^~ 



Fig. 61. Shews how Europeans ave injected with Malaria 

 from the native {children) 



2. Note the usual relation between the degree 

 of ill-health and the proximity of native huts. 

 Make a map shewing European dwellings and 

 shewing huts and hovels in relation with these 

 (Fig. 61). 



3. Make a thorough investigation of the 

 conditions in these huts. 



