AND DERIVATION OF ROSOLIC ACID. 7 
that hereby one of the delusions regarding colours and 
other riches from coals is destroyed. 
Another resinous body of a pure red, when alkaline, 
without any shade of rose, is found along with it, and 
several new substances will certainly come out of this field 
if laboured in. 
The scientific examination of this substance is by no 
means completed here; but for the first time a mode of 
obtaining it at pleasure is put into the hands of chemists. 
