215 
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. 70). 
3. Make a thorough investigation of the con¬ 
ditions in these huts. 
(i) The percentage of infected children in each 
group. 
(ii) The degree of infection of the adults. 
(iii) Roughly estimate the number of Ano- 
;phelines present, whether swarming, abundant, scanty, 
or impossible to detect by search. In the latter case 
make several ‘ test pools.’ 
(iv) Determine the species present and the 
relative numbers of each. 
(v) Determine the sporozoit rate for each 
species. 
(vi) Carefully map all breeding-places, noting 
what larvae are found. 
4. Capture as many Anophelines as possible in 
the European houses, especially in the morning, 
and by looking within the nets. Determine the species, 
sporozoit rate, and from where probably derived. 
In investigating the malaria of any such settle¬ 
ment, native and European, continue the observations 
if possible throughout the year. Make observations 
on— 
1. Seasonal variations in the endemic index 
(percentage of infected children). 
2. Seasonal variations in the number of Ano¬ 
phelines at any time of the year. 
4. Distance of flight of Anophelines from breeding 
grounds, etc. 
5. Sporozoit rate of Anophelines at different times 
of the year. 
