351 



30 lbs. of small twigs yielded 1/07 ozs. of camphor 



= 0*22 per cent. 

 9o lbs. of large twigs and wood yielded 9*8 ozs. of 



camphor = 0*66 per cent. 

 29.1- lbs. of Roots yielded 5*7 ozs. of camphor and oil 



= 1-2 per cent. 



The camphor in these experiments was of a brownish 

 colour, due to contamination with iron oxide or rnst from 

 the condenser. 



Most of the camphor scraped from the copper tubes of 

 the condenser was almost white, which leads to the con- 

 clusion that a copper condenser would not discolour the 

 product. The discoloured camphor can readily be rendered 

 white by redistillation through a glass condenser or by sub- 

 limation. 



Period of Distillation. 



In the small preliminary experiments it was found that 

 all the camphor and oil distilled over within three hours or 

 rather less, in fact the greater portion of the camphor 

 distilled over within half an hour after steam commenced 

 to pass through the material. In the later experiments the 

 distillation was carried on for a longer period than three 

 hours in order to ascertain whether in the large plant, 

 similar results would be obtained. In each case the cam- 

 phor and oil from three hour distillations were collected 

 separately and the following results obtained. 



(1) Distillation of leaves. 



First period of three hours. Camphor and oil obtain- 

 ed = 1*0 per cent. 

 Second period of three hours. Trace only. 

 Third period of three hours. Nil. 



(2) Distillation of twigs. 



First period of three hours. Camphor and oil = 0*20 

 per cent. 



Second period of three hours. Camphor and oil = 0*022 

 per cent. 



Third period of three hours. Nil. 

 (:>) Distillation of wood. 



First period of three hours. Camphor and oil obtain- 

 ed = 0*56 per cent. 



Second period of three hours. Camphor and oil = 0-075 



Third period of three hours. Camphor and oil = 0*022 

 (4) Distillation of roots. 



First period of three hours. Camphor and oil = 1*0 

 per cent. 



