MADDER DYES FROM COAL. 
65 
are capable of being converted into it ; so that it is not im- 
probable that the desired increase may be obtained by some 
modification in the heating of the coal. When the first coal- 
tar dye was made from aniline, the latter substance was lite- 
rally a rare body ; it was not long, however, before a method 
was discovered by which it could be prepared in large enough 
quantity to meet the demand for it. So, we may expect, will 
this soon be the case with anthracene. 
Even as it is, large quantities of artificial alizarin are manu- 
factured both at home and on the continent, and it is com- 
peting in the dye-market with the preparation from madder 
root. 
VOL. XI.- xo. XLII. 
F 
