Low-lying and swampy ground (70.37 mow), potential and actual breeding grounds of the anopheline mosquito were filled in by the Public Works Department mostly with ro-fuse, afterwards covered with mud, Ponds, creeks and ditches were dealt with dri this way.
In addition, many small ditches and pools are Miied in by our own staff, especially after such places have-been found to be breeding anopheles.
Low-lying land filed in:—
Eastern 404400 8g ft.
'230300 on S72 MOM zat mow Total salo20 a. f= 7837 mow Observations on Experiments Owing targely to the increase in malaria, the anti-mosquito prevention methods of the department have been the subject of considerable review and experimentation, As a result of this it fas been de-elded that Ginsburg's larvicide was both less expensive and more convenient to use than the older forms fof anti-mosquito lls.
Previous, however, to use of the above mixture, considerable expert. mentation slong similar lines had taken place. Since these experlments are still inconclusive, it is only necessary to note that the various chlore-compounds were found tremely valuable adjuvants to antimalarial lls. Experiments were also undertaken with such substances as croton and thiodiphenylamine and "At the same time, in-view of the work of Dr. B. de' Meilion, of the Department of Entomology'S. African Institute for Medical Resea tempts were made to increase' the value of the anti-adult mosquito Tumigation sprays.
(Continued on page 230.)
Text read from the printed page and cleaned; old type leaves the occasional error.