— 691 — 
Our knowledge of coagulation and methods of coagulation. Dr. Philip- 
Schidrowitz, London, England 364 
Electrische coagulatie. Electrical coagulation. P. S. Clignett, Modjo- 
sragen, Java 374 
Coagulatie van latex, door middel van rook. Coagulation of latex by 
means of smoke. R. W. Lash, Goenoeng Toenggal, Java .... 380 
Tackiness of Rubber. Dr. K. Gorter, Buitenzorg, Java 385 
Licht gekleurde rubber. Ligt coloured rubber (' Summary). Dr. A. J. Ultée 
Djember, Java . • 391 
Schimmels en bacteriën op bereide rubber. Pilze und Bakterien auf 
bereitetem Kautschuk Dr. P. Arens, Malang, Java 397 
Remarks on scientific rubber research and its importance for the pros- 
pects of plantation rubber. Prof. Dr. G. van Iterson Jr. Delft, Ne- 
derland 401 
De wenschelijkheid van internationale keuringsmethoden van ruwe 
rubber. On the desirability of international testing methods for raw 
rubber. J. G. Fol 411 
The manufacture of rubber goods. J W. van de Stadt, Singapore, 
Straits Settlements 460 
Hoofdstuk. V. Chapter. V. 
Economie. Economical questions. 
Die wirtschaftliche und finanzielle Seite der Kautschukkultur. E. Helf- 
ferich. Hamburg, Deutschland 469 
The acquisition of land on long lease in Java 1). E, A. O. Vervooren, 
Bandoeng. Java, and T. Ottolander Banjoewangi, Java 480 
The rubber undertakings in Java 1). E. A. O. Vervooren, Bandoeng, 
Java and T. Ottolander, Banjoewangi, Java 486 
The cost-price of Hevea-rubber in Java 1). E. A. O. Vervooren, Ban- 
doeng Java, and T. Ottolander, Banjoewangi, Java 494 
Planters' Organisation in Java 1). E. A. O. Vervooren, Bandoeng, Java, 
and T. Ottolander, Banjoewangi, Java 509 
Descriptive Review of the methods in vogue, and the economie condi- 
tions existing in the cultivation of Hevea Brasiliensis on the East 
Coast of Sumatra, V. Ris, Medan Deli, Sumatra, and Dr. J. G. C. 
Vriens, Medan Deli, Sumatra 514 
Tenure and transfer of land in the Straits Settlements and the Federa- 
ted Malay States. D.J. Perkins, Singapore, Straits Settlements. . 532 
Health and sanitation of Rubber Estates in the Federated Malay ' 
States and Straits Settlements. Dr. Wilfred Parsons, Seremban, F.M.S. 543 
Planters' Associations in British Malaya. H- C. E. Zacharias, Kuala- 
Lumpur, F.M.S 555 
Zie ook: E. A. O. Vervooren en T. Ottolander, Beknopt overzicht van de 
economische voorwaarden, waaronder de rubbercultuur op Java gedreven 
wordt; uitgegeven bij gelegenheid van het Rubber-Congres Batavia 1941 
