348 



(6) 6th distillation. 500 grams of leaves (mouldy) 

 gave 6*26 grams of camphor and oil = 1*25 per cent. 



(7) 7th distillation. 500 grams of leaves previously 

 dried in the sun for two or three days, gave 6*27 grams, 

 (weight of dried leaves = 300 grams) camphor and oil = 1*25 

 per cent. Calculated on air dried leaves = 2*09 per cent. 



(8) 8th distillation. 500 grams of leaves (mouldy) 

 gave 7*35 grams camphor and oil = 1*47 per cent. 



(9) 9th distillation. 750 grams of leaves and twigs 

 previously air dried. (Final weight = -468 grams) gave 

 S-27 grains of camphor and oil = I'lO per cent. Calculated 

 on air dried material = 1*77 per cent. 



(10) 10th distillation. 500 grams of leaves air dried, 

 (Final weight = *240 grams) gave 5*83 grams camphor and 

 oil = 1*16 per cent. Calculated on air dried material = 2*4 

 per cent. 



(11) 11th distillation. 500 grams of mouldy leaves, 

 air dried, (Final weight = '270 grams) gave 7*71 grams 

 camphor and oil . = 1*54 per cent. Calculated on air dried 

 material = 2*8 per cent. 



(12) 12th distillation. 500 grams of whole leaves air 

 dried, (Final weight = '285 grams) gave 7*53 grams camphor 

 and oil = 1*50 per cent. Calculated on air dried material = 

 2*6 per cent. 



(13) 13th distillation. 500 grams of leaves and twigs 

 etc., gave 7*92 grams of camphor and oil = 1*58 per cent. 



Conclusions: — These experiments show (1) that a 

 much larger percentage of camphor and oil is obtained from 

 the leaves than from the young wood or twigs. 



(2) That air drying has no detriminal effect on the 

 yield: — if air drying be resorted to however, it should not 

 be carried out in direct sunlight. 



(3) That the principal product is camphor with a 

 small percentage of oil. 



(4) That a yield of at least 1 per cent of camphor 

 with a small percentage of oil may be expected from the 

 prunings of trees of this age viz : 5 years, and probably from 

 trees younger than this. 



Further Experiments on a Larger Scale. 



As the above preliminary experiments appeared to be 

 so satisfactory it was decided to erect a large still on a more 

 practical scale. 



A plant was constructed on our design by the Federated 

 Engineering Company, Kuala Lumpur, and although satis- 

 factory, experience has shewn that it can be improved in 

 many ways. _ 



