246 



not solely tinctorial, we next endeavour to ascertain the extent of 

 the pigmentary variations. 



Our first experiments in this connection were efforts to deter- 

 mine the relative tinctorial intensity of extracts of different 

 samples of heart-wood sawdust made with equal volumes of various 

 solvents under similar conditions of temperature, shaking, etc., 

 from the same quantities of material dried to constant weight at 

 110° C* Among the samples were several inferior qualities of 

 red wood from dead and decaying trees. 



Table IV gives our first results in this connection. The figures 

 in that table denote the relative positions in a series of ten 

 extracts — I indicating weakest colouration, 2 the pigmentation of 

 next higher intensity and so on to 10 showing the most decided 

 tinctorial effect. 



The shade of colour varied with each extractant, as would be 

 expected. The following observations were made in this connec- 

 tion, on the colour of the series of extracts referred to in TABLE IV. 

 I. Water — slight yellowish-brown to deep reddish-brown. f 

 ri. 0.2 per cent. HCl — faint yellow to orange. 



III. 2 per cent. HCl— faint yellow through reddish br >wn to bright red. 



IV. 0.01 per cent. KOH — chocolate colouration throughout. 



V. 0.15 per cent. KOH — deep chocolate colouration throughout. 

 VI. 0.5 ver cent. Na^ C03 — chocolate colouration throughout ; less than in 



V, greater than in IV. 

 VII. Saturated borax solution — faint yellow to deep reddish-yellow. 

 VIIL Ether— faint yellow to orange. 



IX. Absolute alcohol — faint yellow to red. 



X. Acetone —faint yellow through greenish-yelh^w to yellowish-red. 

 XI, Acetic ether — faint yellow to deep reddish-yellow ; brighterthan in VII. 

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

 XIII. Benzol — no eolour in any. 



TABLE IV. 

 Relative pigmentation of vaki <vs kinds of logwood. 



j_« Bastard" (very poor). £ -" B;.stard" (very poor). (7— Immature wood 

 of varying tints. D — " Purple" (from tree on extremely poor marly bank ; tree 



* Drying oc- mrcd rapidly and seemed to have no transforming effect on the duet. 

 This faci was noted before in another connection (page 243). 



fThe colouration intensities are indicated progressively from ! to 10 (see TABLE IV; 

 Individual exceptions jue not referred to. 



J This sampl contained several pigments. One of these was purplish and quite un- 

 like any in the other samples. The pigment was especially soluble in water. It w» s not 

 ordinary hematoxylin. 



