SUNIER: Marine fish-ponds of Batavia. 177 
From the following it will appear that the influence of evaporation, 
which is largely dependent on the regular and forcible prevalence of the 
dry East-monsoon wind, does not, from the nature of the case, act with 
equal strength every year. 
The salinities collected in Table III I calculated from some figures 
indicating the “amount of NaCl” which were determined some time ago 
by Dr. B. C. P. JANSEN of the Medical Laboratory Gun) Labora- 
torium), Weltevreden, for Mr. VAN BREEMEN, 
The place names occurring in Tables II to X refer to that part of the fish- 
pond belt of Batavia in which the ponds in question are located. All 
those names are to be found, as has been said before, on Map I. 
We can now place side by side the following data, borrowed from the 
Tables i, IH and VI. 
Muara Karang Fluit Pekulitan Jaagpad 
1917 1918 | 1919 1917 1918 1919 | 1917 | 1918 1917 | 1918 
ea XT |15/,; XI 28 X BON lan OSU ES DIU ES Acie GU I ACH EXT 
1 | 
12-305 9/99 | 36.2-40 °/00/38.4-76.6 0/00142.9-74.5°/oo| 14-27 °/00 \44.6-84.6°/00|36.1-40 %/00 | 19.5-24 °/00 | 36.2-40 °/o0 10.5-27 °/o9 31.1-65.1 °/o0 
etc., cf Table | 
| 
Furthermore Table III proves that between October 23rd and December 
12th 1917, out of 91 salinity determinations there was no one higher than 
32.5 °/,). Therefore contrary to what was observed in 1918 and 1919, the fish- 
pond water in the autumn of 1917 had at the utmost the same salinity as sea- 
water. These results agree with the difference in meteorological respects between 
the East-monsoon of 1917 on one hand, and those of 1918 and 1919 on 
the other hand (cf. also page 280 ). For among the data recorded at the Royal 
Magnetical and Meteorological Observatory, there are indications to show that 
whilst the very dry East-monsoon of 1918 must have strongly promoted 
evaporation of the fish-pond water, the extent of the influence of the 1917 
East-monsoon on the evaporation must have been a little less than the average. 
But also in the years when the general and strong prevalence of the 
East-monsoon brings about a strong evaporation of the fish-pond water 
the increase of the salinity in the different ponds shows itself in different 
degrees, and in some ponds it practically does not manifest itself at all. 
This appears in the first place from Table II, in which I have collected a few 
salinities which I gathered on a number of excursions between the regular 
observations. From this table it may be seen that whereas in many parts 
of the fish-pond belt the salinity after the middle of July 1918 was 
1) Moreover, as I stated before, on November 4th 1919 a salinity of 93.2 °/o) was met 
with in a small fry- pond, which however was not in use at the moment. 
