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leaves, of which a synopsis is given below: The author first deals with 

 the distillation of leaves which had been spread out for drying in a small 

 cinchona-plantation shortly before the setting-in of the rains, but which 

 were not yet quite dry. The camphor-yield from these leaves was too 

 small to make it worth while estimating it, and the experiment was set 

 down as a failure. For a subsequent distilling-experiment a plantation 

 was subjected to moderate cutting, when a quantity of dry fallen leaves 

 was found on the ground between the rows of plants. These were first 

 distilled and only yielded 0,06% crude camphor and 0,19°/o camphor oil, 

 showing that they had lost almost the whole of their volatile constituents 

 during the long time they had been lying on the ground drying, exposed 

 to the alternating effects of rain and sun. 



Next the green leaves were dried on previously cleaned ground under 

 the shade of cultivated cinchona trees. In the course of about a fortnight 

 they were dry enough to be readily stripped from the branches and, col- 

 lected in sacks, they were carried to the still. This experiment gave a 

 thoroughly satisfactory result, the yield being 1,55% crude camphor and 

 0,49% camphor oil. The result would certainly have been better still but 

 that on one occasion, in the course of the distilling process, the con- 

 densing-water became heated, and a not inconsiderable quantity of camphor 

 was thereby lost. 



In view of the fact that present experience on the effects of cutting 

 upon the growth of the trees shows it to be a pretty well established 

 fact that it is possible to cut the trees twice a year, it is reasonable to 

 expect a five-year old plantation to yield about 8400 lbs. of dry leaves 

 per acre. This would be equivalent to an output per acre of about 325 lbs. 

 of camphor and about 103 lbs. of camphor oil. 



H. W. Emerson and E. R. Weidlein 1 ) have distilled camphor oil in 

 Jamaica, and have confirmed the observation recently made that the leaves of 

 the plant can be successfully employed for this purpose. From 56,940 kilos 

 green leaves they obtained 1353,8 grams = 2,35% crude camphor and oil 

 (1,32% camphor, 0,54% camphor oil and 0,49% water), and from 67 kilos 

 dry leaves 1719,5 grams = 2,54% of a distillate comprising 1,57% camphor, 

 0,46% camphor oil and 0,51% water; 22425 grams twigs and green 

 leaves yielded 0,58% camphor and 0,26% camphor oil, 8770 grams twigs 

 and dried leaves contained 0,54% camphor, and 1800 grams wood, when 

 distilled, yielded 0,61% camphor. \ 



Besides camphor the oil contained pinene, phellandrene, cineole, 

 dipentene, and safrol. It is not quite clear from the reference whether 

 the safrol was detected by the authors in oil distilled from the leaves or 



: ) journ. Ind. Eng. Chem. 4 (1912), 33. Quoted from Journ. Soc. chem. Industry 

 31 (1912), 149. 



