351 
;>0 lbs. of small twigs yielded 107 ozs. of camphor 
= 0*22 per cent. 
93 lbs. of large twigs and wood yielded 9*8 ozs. of 
camphor = 0-66 per cent. 
291 lbs. of Loots yielded 5*/ ozs. ot camphor and oil 
" 1*2 per cent. 
The camphor in these experiments was of a brownish 
colour, due to contamination with iron oxide or rust 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 ijot discolour the 
pioduct. 1 he discoloured camphor can readily be rendered 
white by redistillation through a glass condenser or bv 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 onlv. 
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. 
(3) Distillation of wood. 
I irst period of three hours. Camphor and oil obtain- 
ed = 0*56 per cent. 
Second period of three hours. Camphor and oi 1 = 0*075 
Third period of three hours. Camphor and oil = 0*022 
(I) Distillation of roots. 
First period of three hours. Camphor and oil = TO 
per cent. 
