"ملف 2/7 II مُراسلات بخصوص الاحتياطات والأمور الأخرى المتخذة لمكافحة الملاريا" [و‎‎٧‎٣] (٢٩٦/١٤٥)

figures of attendances fox* malaria during these years (iVoo-
13^7). The fortnightly mean temperatures are also indicated
In Chart I, from which It will be seen that the season of
Incidence of malaria coincides with the period during which
the mean temperature ranges continuously between 7D°F. and
90°F. This occurs in two distinct periods, the first of
which begins about the end of April and lasts till the first
_ week of July, while the second comprises the months of
October and November. It will also be seen that the length
of the period in which the temperature prevails within this
range influences the degree of malaria occurring during that
season, and with the exception of the year 1937 malaria
prevailed more markedly during April and Kay than in the
autumn months. The prevalence of the disease, however, does
not show the same degree of correlation with humidity and
rainfall as in Northern India, the reason being that in these
islands the humidity Is favourable for the life of mosquito
throughout the year, and the determining factor for the
incidence of the disease is the temperature. In Northern
India, on the other hand, favourable humidity prevails only
during a limited period during and after the monsoon.
These figures are, however, being subjected to further
analysis ann will be alluded to again in the final report.
(c) Kolaon rates.
In order to determine reliable spleen rates for each
1 cality, it was considered that religious schools would be
more suitable, as they were attended by children between 4-14
years of ages from houses in the iunodiate neighbourhood.
Table IV shows the results of these examinations.
yy 0ra Table IV it will be seen that the occurrence of
enlarged spleens is not uniform. Thus, in Manama town where
it was possible to conduct the examination of a sufficient
number of children in the different parts of the town, the
maximum number of enlarged spleens was encountered in the