144 Treubia Vol. Ill, 2. 



The hard phosphor bronze suction and dehvery pipes were cast and 

 installed by the N. V. Machinefabriek en Scheepswerf "Batavia" of Batavia, 

 while the ebonite cocks and the ebonite covers of the earthenware outlet 

 pipes were manufactured by the Nederlandsche Gutta Percha Maatschappij 

 of Batavia. 



The filling of the aquarium with sea water was performed in two 

 stages on 12th and 19th of September 1922. By the help of a combined 

 tug and auxiliary fire-tender belonging to the Harbour Board of Tandjong 

 Priok and of an iron water-lighter, I fetched pure seawater from a few 

 nautical miles to the North East of the Island of Hoorn in the Bay of 

 Batavia. This seawater was pumped out of the waterlighter and into the 

 aquarium on the next days by means of the motor pump of a municipal 

 watering-cart. 



The four compartments of the lighter had been thoroughly cleaned 

 by the Harbour Board, painted with rust-proof paint and finally coated 

 with cement grouting some weeks beforehand. 



These four compartments, whose combined capacity amounted to 175 

 tons approximately, were three-parts filled with seawater within an hour 

 by the fire-tender working with four hoses. 



The motor-pump of the watering-cart transferred this quantity of seawater 

 through a delivery-hose, 160 Metres long, to the aquarium in 5 to 6 hours. 



The salinity of the first and second shipment of seawater amounted 

 to 32.3 %o and 32.7 o/^q respectively. 



From the beginning the scientific institution called "'s LANDS Plan- 

 TENTUIN" (Botanical Garden) at Buitenzorg has always offered with 

 much success opportunities for study to naturalists of all nationalities By 

 the building of the new Laboratory for Marine hivestigations these oppor- 

 tunities have been extended over an entirely new sphere. 



The strangers' work room of the new Laboratory has already been 

 described above. As soon as the aquarium is entirely in working order, 

 students will have access to aquaria placed on the tables No. 3 of Plan 

 No. 3 and connected with the sea water circulating ducts and, if necessary, 

 also to one of the tanks. 



A small but seaworthy motor boat which has the distinction of bear- 

 ing the name of the leader of the Siboga Expedition, "MAX WEBER" (see 

 Photo No. 8), is at the disposal of those who work in the Laboratory for 

 the purpose of collecting marine organisms in the neighbourhood of Batavia. 



Professor Dr. C. Ph, Sluiter, of the University of Amsterdam, refers 

 to the great riches from a zoological point of view of the Java Sea in 

 the neighbourhood of Batavia (Natuurkundig Tijdschrift voor Nederlandsch- 

 hidië, Volume 47, page 182). 



The many coral reefs in the Bay of Batavia respresent, in themselves, 

 an extremely rich field for study. 



