194 TREUBIA VOL. Il, 2—4. 
18.4 Joo Muara Karang 23 V ’19 
18.7 "Joo Heemraad-Oost 10 I 719 
19.2 °/o) Heemraad-Oost 26 I 719 
19.3 °/ Muara Karang 25 V ’19 
19.9 °/) Heemraad-Oost 11 I 719 
20.1 °/oo Heemraad-Oost 22 I ’10 
20.2 °/ Heemraad-Oost 24 I 719 
20.3 °/oo Heemraad-Oost 12 | 719 
21.7 "Joo Heemraad-Oost 23 I 719 
21.8 Joo Heemraad-Oost 27 I 719 
22.75 °/o) Heemraad-Oost 28 I 719 
23.9 [99 Heemraad-Oost 25 I 719 
26.2 °/oo Heemraad-Oost 4 XI 718 
26.7 °/oo Heemraad-Oost 29 I 719 
27.5 Joo Hleemraad-Oost 19 I 719 
32.0 loo heemraad-Oost 30 1 719 
We are struck in the first place with the fact that Najas falciculata 
was met with very frequently in the ponds of Heemraad-Oost, which ponds 
are among the exceptional ones in which also towards the end of the East- 
monsoon the water has a salinity which is generally a good deal lower, 
or at all events not higher than that of sea-water (cf. Chapter Il). 
It further appears that out of the sixty cases tabulated above when 
the presence of Najas falciculata was observed, this plant grew: 
in 2 cases at a Salinity below 5 0/5 
in 12 cases at a salinity between 5°/ and 9.9 °/oo 
in 21 cases at a salinity between 10 °/oo and 14.9 °/oo 
in 14 cases at a salinity between 15 °/o) and 19.9 °/oo 
in 7 cases at a salinity between 20 °/oo and 24.9 0/5 
in 3 cases at a salinity between 25 °/o) and 29.9 0}, 
in 1 case at aysalinity.) of 32.6 °/oo 
To summarize the above I can say that Najas falciculata R. BR. was 
found by me in the Batavia empangs: frequently at salinities below 20 nos 
less frequently at salinities upwards of 20°/,, only very occasionally at 
salinities slightly above 30 %/,, and never at a salinity higher than 32.6 Ceo: 
In conclusion the above shows that Najas falciculata R. BR. occurs 
in ponds situated near Muara Karang, Pekulitan, Luar Batang, Heemraad, 
Heemraad-Oost and Tjilintjing, that is to say over the entire extent in the 
direction from West to East of the Batavian fish-pond belt. 
