1 70 PARA RUBBER. 



and Gardens, Penang, and from the Curator of the Perak 

 Museum, with the request that they should be examined and 

 their commercial values ascertained. These samples have been 

 submitted to chemical examination in the Scientific and Tech- 

 nical Department of the Imperial Institute, with the following 

 results : 



The kernels constitute about 50 per cent, by weight of the 

 whole seeds. On extraction with light petroleum they yielded 

 42.3 per cent, of oil (specimen A), whilst the whole seed (husk 

 and kernel ground together) furnished 20 per cent, of oil 

 (specimen B). 



The oil obtained from the kernels alone is clear, of a light 

 yellow colour, and has an odour somewhat resembling that of 

 linseed oil. It belongs to the class of drying oils, and yields a 

 clear, transparent film when allowed to dry by exposure to air. 

 The husks contain a solid fat, which has a high saponification 

 number and a low iodine value, but since the amount of this 

 solid fat in the husks is very small, it makes but little difference 

 to the properties of the oil obtained from kernel and husks 

 ground together. The following table gives the constants found 

 for both specimens of the oil, those of linseed oil being added 

 for comparison : 



On saponification with caustic soda, Para rubber seed oil 

 yields a rather soft soap of yellowish colour. It was found that 

 the time required for the complete saponification of this oil is 

 about half as much again as that required in the case of olive oil. 



