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(?) The seed may be roasted in a pot, pounded in a 

 mortar and placed in four times its volume of water, which is 

 kept boiling. The mixture is constantly stirred with a wooden 

 spoon. After a time the pot is removed from the fire and 

 the oil skimmed off. The residue is then allowed to cool and 

 next day it is again boiled and skimmed. The second day's 

 skimming gives better oil which is kept separate. If the 

 beans are over-roasted a smaller proportion of oil is obtained. 

 The proportions of oil to cake &c. obtained by this method are 

 30^ per cent, of oil : 43^ per cent, of cake : 26 per cent, of 

 husk wastage. 



(3) The seed may be hrst boiled and then dried in the 

 sun for 2 or 3 days, then pounded in a mortar, placed in 

 4 times its volume of water which is kept boiling, while the 

 mixture is stirred with a wooden spoon as before. The 

 skimming ol the oil takes place as in process No. 2, The 

 oil thus obtained is a superior lamp-oil to that obtained 

 by process No. 2, though it is inferior to that obtained by 

 process No. i. 



(4) The seed may be soaked fora night in water, and next 

 morning ground up in an ordinary ghant. The oil is removed 

 gradually by putting a piece of cloth into the pulp and squeez- 

 ing the oil out of the cloth into a pot. This oil is also a 

 better lamp-oil than that obtained by roasting the beans. 

 This process gives the best oil-cake. 



385. That cold-drawing with proper machinery gives a 

 larger yield ought to encourage capitalists to adopt this method 

 of extraction more and more. After the cold drawn oil has 

 been obtained by pressing the kernels in gunny bags, it is put 

 in galvanized iron vats and bleached by exposure to the sun, 

 which also causes the sediment to precipitate. The oil is then 

 filtered through vegetable charcoal and flannel bags. In the 

 Rajshahi Jail, fire is put underneath the machine when the 

 kernels are pressed in canvas bags. This increases the yield 

 of oil by 10 per cent., but some of the irritating and noxious 



