— 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 o' 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 it3 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 |ava 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 econom.ic condi- 

 tions existing in the cuitivation 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 



1) Zie ook: E. A. O. Vervooren en T. Ottolander. Beknopt overzicht van de 

 economische voorwaarden, waaronder de rubbercultuur op Java gedreven 

 Avordt; uitgegeven bij gelegenheid van het Rubber-Congres Batavia 1941 



