RUBBER 687 



germinate quickly and grow vigorously, for thin crepe 

 rubber is usually dried in twelve days at the outside, and 

 in most cases much quicker than this. Quick germina- 

 tion and vigorous growth are the two essentials in a 

 spot-producing organism, for the period during which 

 moisture can be obtained for growth is very limited. 



As regards the quality of spotted rubber, Morgan says 

 that vulcanization experiments prove that it is not inferior 

 to clean rubber. But loss of money and much worry is 

 the lot of the estate manager troubled with spotting, for 

 the presence of spots in the best grades decreases the 

 value so that the rubber is placed in a lower grade and 

 forward contracts can only be met with difficulty. 



Attention to the methods of prevention indicated here, 

 and to general cleanliness in preparation, will make light 

 the difficulty caused by spottings. 



LITERATURE CONSULTED. 



BANCROFT, C. K. " The Spotting of Plantation Para Rubber" 

 (Preliminary Account of Investigations on the Cause of Spotting), 

 Bulletin No. 16, De-pi, of Agric., F.M.S. 



BANCROFT, C. K. " Notes on Investigations of Plant Diseases 

 in the Federated Malay States during ign," Agricultural 

 Bulletin, Federated Malay States, vol. i, No. 2, pp. 30-34. 



BANCROFT, C. K. " Occurrence and Nature of Spots on Sheet 

 and Crepe," Agricultural Bulletin of the Straits and F.M.S., 

 vol. x, October, IQII, p. 319. 



FOL, J. G., and SOHNGEN, N. L. " Die Zersetzung des Kauts- 

 chuk durch Mikroben," Centralblatt fur Bacteriologie, Parasiten- 

 kunde und Infectionskrankheiten. 



MORGAN, SIDNEY. " The Preparation of Plantation Para 

 Rubber" (London, 1913). 



SHARPLES, A. " Spotting of Prepared Plantation Rubber," 

 Bulletin No. 19, Deft, of Agric., F.M.S. 



WEHMER, Dr. Prof. CARL." The Genus Penicillinm," Lafar's 

 "Technical Mycology." 



WHITBY, G. S. " Ueber einige Vorlaufige Beobachtungen 

 beziiglich der Ursach'en natiirlicher Veranderungen im Latex 

 von Hevea brasiliensis," Sonderabdruck aus der Zeitschrift fur 

 Chemie und Industrie der Kolloide, Heft 2, Band xii. 



44 



