SUNIER: Marine fish-ponds of Batavia. Dini 
Furthermore VAN BREEMEN (°°) says (page 94, Table VIII) that in the 
autumn of 1918 far fewer /udlowi imagines were captured in the kampongs 
situated west of the old city (Kotta) of Batavia and south of the empangs 
that hardly produced any more /zdlowi, than there were caught in the 
kampongs situated south of the ponds of Heemraad and Heemraad Oost, 
which ponds still contained water of a low salinity and therefore still 
produced /zdlowi. 
It is true that VAN BREEMEN’s (°°) figures concerning the mosquitos 
captured in the houses are strictly speaking just as little mutually comparable 
as the larvae-captures discussed before, so that they do not really furnish 
conclusive data respecting the actual numbers of /zdlowi imagines present. 
Nevertheless I think we may safely assume that in the opening months 
of 1919, particularly in the western part of the Batavia empang zone, 
where the /zdlowi production had been practically reduced to nil in the 
latter half of 1918, and where outside the empangs no other /zdlowi 
breeding-places occurred, there were no longer so many /zdlowi females 
present that could go and lay their eggs in the empangs, in which the 
salinity had suddenly gone down again very low, but where no more 
ludlowi larvae had been present for a considerable time. Hence it must 
in the natural course of things have taken some time before the /zdlowi 
production reassumed important proportions, after the sudden lowering of 
the salinity. 
Secondly it should be considered that during the West monsoon and, 
as long as considerable rains continue to fall, also in the succeeding 
spring, certainly a smaller percentage of the /zdlowi mosquitos that have 
been produced will succeed in laying their eggs in the empangs than will 
be the case later in the year when the weather has become more favourable 
to the mosquitos. 
And in the third place there is the question of the submerged vege- 
tation. | have explained above how the conglomerates of submerged plants 
either reaching up to the surface of the water or floating on it conduce 
vastly to the production of Anophelines. Furthermore I have described in 
Chapter IV how at the end of the year and at the beginning of the new 
year the submerged vegetation, originally reaching up to the water’s surface 
or floating on it, has been in part consumed by the bandeng and that 
an other part of it has sunk to the bottom after the falls of rain, so that 
just towards the end of January and the early part of February after the 
capture of the bandeng for the Pasar Malem') the development of the 
submerged vegetation is at its lowest. Subsequently a fresh submerged 
vegetation begins to develop in the course of the next spring in connection 
with which the conditions become gradually more favourable to the Ano- 
pheline larvae. Of course the submerged vegetation develops earlier in 
one year than in another. Thus in the spring of 1919 the submerged 
1) cf. note page 196. 
