KING INSTITUTE, GUINDY, FOR 1927-28

11

to be a great assistance in investigation to enlist the aid of the people by treating
them.

       Table X which follows gives the spleen and parasite rates of several villages.
Since the Mopad area was well examined at the last visit, more attention was
paid this time to villages in the area around, in order to give an idea of the
prevalence of malaria in these parts where the conditions varied from those of
Mopad as regards some important details.

                   TABLE X.—Spleen-parasite rates in November and December 1926.

       In examining the table the rates for children are those which should be
considered as the most important. It is regretted that the numbers examined are
not larger. An inspection of Map III will assist the reading of the table. It will
be remembered that at the first visit malaria was found to be severe not only in
the irrigated Mopad area (group A), but also in unirrigated villages near and on
the other (the north) side of the Maneru river (group B). This was confirmed
by the autumn visit. Further malaria was found to be equally severe in the
village south of the Mopad area on the next river the Vuppuvagu. The first
portion of the area (group D) controlled by the Mopad canal extension south of
the aqueduct across the Pillaperu Maneru River was also visited and it was found
that there was much less malaria than in the Mopad area. The first two villages
are irrigated from a tank fed from the canal, but the third Tsallavaripalli with
the least malaria is on a higher ground near the canal and is unirrigated. It is
also farther from the river Pillaperu than the other villages, so this village might
equally well be placed in group C villages which are not irrigated and not near
rivers. The great difference between the malaria rate in this group and groups
A and B is noteworthy.

         4. Adult mosquitoes,— The following table describes the catch:—

TABLE XI.—Total mosquito catch.

2-A