SUNIER: Marine fish-pond of Batavia. 185 
VAN KAMPEN (2) says that “tay-ayer” is “a dirty-grey (vuilgrauw) mass 
consisting of a blue-alga (Oscillaria sp.)”. Undoubtedly Blue-algae (Cy- 
anophyceae = Schizophyceae) and especially Oscillatoria-like forms constitute 
the main part of “tay-ayer’. Beside these latter, however, I also found 
Lyngbya-, Spirulina-, Microcoleus- and Nostoc-like forms in “tay-ayer”’-samples. 
Among these Schizophyceae-filaments are often found a great many 
small Nematodes (Enoplidae or Anguillulidae (?)), frequently also Amoebae. 
Diatomaceae also occur plentifully in tay-ayer, chiefly Pleurosigma-like 
forms, in the second place also forms like Amphipleura, Toxonidea and 
many others. Samples of tay-ayer also often contain Bacteria. The Schizo- 
phyceae-threads of the tay-ayer may in their turn be overgrown or coated 
with forms like Chamaesiphonaceae and Chlamydobacteriaceae. 
In conclusion I must mention that on March 15th 1918 I came upon certain 
Closterium-like forms, or at any rate Desmidiaceae, in a sample of tay-ayer 
drawn from a pond the water of which at that moment had a salinity 
varying between 15.5 °/,, and 21 °/,). As far as | am aware the salinities 
mentioned are very high for Desmidiaceae. 
Chaetomorpha 1 found in the Batavia empangs at all the salinities 
observed in them, varying as stated above between less than 3.5 °/,, and 
84.6 Jo. 1) In my diary I find an entry to the effect that on March 15th 
1918 I observed, a.o. in Mr. Görs’s ponds A and B (cf. Map Il), Chaetomorpha 
in water that was almost fresh or at all events had a salinity below 3!/, °/oo- 
On the other hand it may be seen in Table IV (observation-table) how 
on December 6th 1918 in an empang near Kampong Fluit, the water in 
which then possessed a salinity of 84.6 °/,, I came upon a large quantity 
of floating algae, which proved to consist not only of “dying, yellow, coated”, 
but also of “fresh green Chaetomorpha-filaments with very little coating”, 
together with Chaetomorpha-filaments in intermediate stages. 
In the latter table, for December 7th, 1918, there is also an entry 
concerning a pond near Kampong Fluit, with a salinity of 70.7 °/,., where 
I met with “fine, mostly rather dark-green Chaetomorpha, slightly coated 
to more or less heavily coated; also dead Chaetomorpha clad with 
a red-brown coating”. From the foregoing it therefore results that fair 
Chaetomorpha-filaments evidently in good condition still occur in water 
possessing a salinity as high as 70.7 °/,, or even 84.6 °/ 9. 
Another note in my diary states how on October 28st 1918 I could 
observe that in Mr. Görs’s pond E (cf. Map Il) into which some 
new seawater had recently been admitted and where the salinity was then 
some 50°/,,, a Chaetomorpha vegetation was beginning to develop. 
From the numerous data in my diary and in the observation-table 
(Table IV) I am therefore unable to infer a definite influence of the salinity 
1) Though I observed on the 4th of November 1919 in the fry-ponds C’ (cf. Map II) 
a salinity of 93.2 0/50, the fry-pond whose water showed this high Salinity, at that time 
contained neither fish nor algae. 
