=Algarobilla.=--The seed-pods of _Prosopis pallida_ and _P. Algarrobo_ are known as _algarobilla_, the two kinds being distinguished as _negro_ and _blanco_. The trees are abundant in mountainous parts of South America, notably Chili and the Argentine Republic. The pods contain up to 50 per cent. of a bright-yellow tannin, somewhat resembling that of myrobalans. The friable tannin is readily soluble in cold water, and is so loosely held in the fibrous network of the pod, that great loss is sustained by careless handling. The commerce in algarobilla does not figure in the official trade returns; but J. Gordon & Co., Liverpool, obligingly state that they imported 50 tons, at an average value of 18_l._ 10_s._ a ton, in 1880. Widow Duranty & Son, also of Liverpool, are good enough to add that they received 160 tons in 1881, the first that had reached them for a long time. Havre imported 50 tons in 1881. The name _algarrobo_ is also applied to _Balsamocarpon brevifolium_ in Chili, and to _Hymenæa Courbaril_ in Panama. =Chestnut-extract.=--The wood of the chestnut (_Castanea vesca_) contains 14-20 per cent. of a dull-brown tannin. It is quite different from the bark and bark-extract of the American chestnut-oak (_Quercus sessiliflora_). Its extract is used largely to modify the colour produced by hemlock-extract, and for tanning and dyeing. The pulverised wood is also extensively employed in France. The imports are included in barks and extracts, p. 39. =Cork-bark.= See Oak-barks. =Cutch, Catechu, or Terra Japonica= (Fr., _Cachou_; Ger., _Catechu_).--The term _kát_, _kut_, or "cutch," is applied to the dried extract, containing 45-55 per cent. of dark-coloured mimo-tannic acid, prepared chiefly from 2 trees:--(1) _Acacia Catechu_ [_Mimosa Catechu_, _M. sundra_], a tree of 30-40 ft., common in most parts of India and Burma, growing also in the hotter and drier districts of Ceylon, and abundant in tropical East Africa--the Soudan, Sennar, Abyssinia, the Noer country and Mozambique, though the utilisation of its tannin is restricted to India; (2) _A._ [_M._] _Suma_, a large tree inhabiting South India (Mysore), Bengal, and Gujerat.