304 Mr . Hatchett’s additional Experiments 
which floated on the top of it, and which, as far as could be 
ascertained, amounted to about three grains. 
B. When the whole of the water was come over, there was 
again a slight production of sulphureous gas. I then added 
two ounces of water, which I drew off by distillation, but did 
not obtain any of the vegetable essential oil which has been 
mentioned, nor did the odour of it return, I therefore conti- 
nued the distillation until a dry blackish brown mass remained ; 
this was well washed with warm distilled water, by which, 
however, nothing was extracted ; but when two ounces of 
alcohol were digested on it during twenty-four hours, a very 
dark brown tincture was formed. 
The residuum was digested with two other ounces of alcohol 
in like manner, and the process was repeated until the alcohol 
ceased to act. 
The residuum had now the appearance of a compact sort of 
coal in small fragments, it was then well dried, and after ex- 
posure to a low red heat in a close vessel weighed fifty-three 
grains. 
C. The different portions of the solution formed by alcohol 
were added together, and being distilled by means of a water- 
bath, a blackish brown substance was obtained, which had the 
appearance of a resin or gum with a slight odour of caromel, 
and weighed 49 grains. 
The products therefore which were thus obtained from 100 
grains of camphor when treated with sulphuric acid, were. 
