Gruenberg and Gies : Notes on "bastard" logwood 37:> 



XII. Chloroform — no color in some, faint yellow in others. 

 XIII. Benzol — no color in any. 



Table IV. 



Relative i-igmevtation of various kinds ok logwood. 



A — " Bastard " (very poor), 

 of varying tints. D — "Purple" 

 ture, but dead in nearly all parts, 

 tints. F — "Bastard" (medium 

 H — Red (tree over ripe; wood 

 J — Red (best grade). 



R — "Bastard" (very poor). C — Immature wood 

 ( from tree on extremely poor marly bank ; tree ma- 

 including the roots). E — Immature wood of varying 

 grade). G — Red (tap root of nearly dead tree), 

 bored by ants). /—Red (from roots of dead tree). 



More important, however, than the variations in the shades of 

 color in the extracts was the fact, already noted, that the sequence 

 of coloration intensity (in extracts made under like conditions in 

 detail in each series) varied with each solvent (table IV). This 

 result not only shows that the colors of the woods are not due 

 merely to different amounts of the same pigment but also proves 

 that the pigmentary differences are caused either by varying pro- 

 portions of at least two pigments, or by the same pigment radical 

 in more than one chemical condition — in combinations, it may be 

 of different solubilities and stoichiometric relationships, and of 

 different dissociable tendencies. 



Relative tinctorial differences and variations are further shown 

 in the following sample data, which indicate the quantity of water 

 in c.c. added to 10 c.c. of 0.5 % Na 2 C0 3 extract (table IV) 

 in order to make the tinctorial intensity approximately the same 

 throughout the series, f 



*This sample contained several pigments. One of these was purplish and quite 

 unlike any in the other samples. The pigment was especially soluble in water. It 

 was not ordinary hematoxylin. 



f Dilution of D with an equal volume of water furnished the basis of coloration 

 or the comparative observations. 



