Ccesalpinia coriaria, or DividivL 199 



galls it contains ; therefore, as dividivi seems to be the stronger 

 of the two, it is probable that its ink is more durable, and not 

 less intense in its colour. I may here mention, that the powder 

 of galls was very fine, and intended for sale, but the powder of 

 dividivi was coarse. For the purpose of the dyer, also, it would 

 appear that the use of dividivi would be as beneficial as the use 

 of galls in the black dye, which might slightly differ in its hue 

 and tint, but not at all be inferior to the galls hi the depth of 

 colour. 



16. Sixty grains of dividivi, macerated repeatedly in alcohol, 

 left 16j residuum, and afforded, by evaporating the different 

 tinctures, 41 ^^ grains, indicating a loss in excessive drying, of 2 

 grains. 



17. Sixty grains, treated in the same manner with sulphuric 

 ether, left in one instance 19, and in the other 18 grains of resi- 

 duum, indicating 41 and 42 grains of soluble matter, of which 

 28 and 38J grains only were obtained by evaporation, the re- 

 maining 13 and 8 J grains being driven off in evaporation. The 

 etherial extract was soluble in water, and became intensely black 

 with muriate of iron. 



18. Half an ounce of galls, and as much dividivi, treated 

 with alumina fresh precipitated, left of extracts, the former 30J 

 grains, the latter 36, continuing soft, and not hardening or crys- 

 tallizing, by gradual evaporation in a gentle heat. Where my 

 experiments were repeated, two figures appear in the following^ 

 table, as in columns 2, 3, 5, and 13. 



It is remarked by Captain Macadam, who communicated the 

 above notice of Mr Rodsey's experiments, that one day the pods 

 of the Caesalpinia may become in general use with the tanner, 

 the leather made from them being better than that from oak 

 bark. 



