possessing the Properties of Tannin. 67 



has been mentioned, nor did the odour of it return. I there- 

 fore continued 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 al- 

 cohol 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 

 exposure 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 caro- 

 niel, arid weighed 49 grains. 



The products therefore which were thus obtained from ]00 

 grains of camphor when treated with sulphuric acid, were. 



Grains. 



A. An essential oil which had an odour somewhat 

 resemblmg a mixture of lavender and peppermint, 

 about - - - - - - 3 



B. A compact and very hard sort of coal in small 

 fragments - - - - - 53 



C. And a blackish brown substance of a resinous 

 appearance - - - - - 49 



103 



From this statement it appears, that there was an increase 

 in the weight amounting to five grains, which I attribute 

 partly to oxygen united to the carbon, and partly to a portion. 

 of water so intimately combined with the last product, that 

 it could not be expelled from it by heat without subjecting 

 it to decomposition. The properties of this substance were 

 as follows ; 



1. It was extremely brittle, had somewhat of the odour 

 K 2 of 



