172 PLANT AND ORGANIC CHEMISTRY 



The following is a table of dyewood colors with reagents, 

 yielded by Brazil wood and logwood: * 



The extracts of Saraca Indica bark, containing the coloring 

 principle, were tested with these reagents, and it was observed 

 that the reactions agreed with the haematoxylin colors, and in 

 no case with those of brasilin. However, the colors produced 

 by different alkalies varied in tints as she had found in both the 

 logwood and Saraca extracts, but the general term "reddish- 

 purple solution" is comprehensive. A rose- violet precipitate 

 was yielded by stannous chloride solution with the neutralized 

 acidified extracts of the barks. 



The bark of the logwood-tree is not used for making the 

 commercial logwood extracts, the wood of the tree being em- 

 ployed for this purpose. The presence of a small quantity of 

 hsematoxylin was determined in the specimens of logwood- 

 bark which she examined, and with the bark extracts the same 

 reactions with reagents were obtained as with the logwood 

 extracts, but owing to the smaller percentage of dye in the 

 bark the colors were less intense. In the case of the Saraca 

 Indica bark the colors were very brilliant and indicated the 



1 S. P. Sadtler and Wm. L. Rowland, Am. Jour, oj Phar., February, 1881. 



