_Rhizophora Mangle_, and other allied species, Mangrove or Mangle, _Manglier_, _Paletuvier_, _Cascalote_, grows on tropical coasts all round the world. The barks vary much in strength, from 15 up to 40 per cent. in different species (see _Ceriops_). Leaves, used in Havana, are said to contain 22 per cent. tannin. According to Eitner, the younger plants contain the highest proportion of tannin. _R. Mangle_ seems to yield a bark inferior to several other species. All trees growing in swamp, and of the same character of growth as mangrove, are called “Bakau” in the East Indies (Anglice, mangrove) and various species of _Ceriops_ yield the best tanning bark. A tidal mangrove swamp at low water is a tangle of arched roots like inverted branches on which the trees are supported. The catechol-tannin, which is easily extracted, is of deep red colour and allied to that of the mimosas. In admixture with other materials the red colour has a much smaller effect, and mangrove bark is now largely used in combination with pine, oak and mimosa. Several other species are also rich in tannin, and used in different parts of the world under the name of mangle, as are also several species of _Conocarpus_ belonging to the _Combretaceæ_. _Rhizophora mucronata_. India and Burmah. Bark varies considerably; David Hooper, Indian Museum, Calcutta, gives 26·9 per cent. of tannin. Dr. Koerner (Deutschen Gerberschule, Freiberg) analysed two samples in 1900, one containing 48 per cent. and the other 21 per cent. of tannin; two samples from the British Imperial Institute recently examined by the Author showed only 4·5 and 6·1 per cent. of tannin respectively. _Ceriops Candolleana_, _Bakau_ or _Tengah_ Bark, East Indies. _Goran_, Bengal. Contains up to 27 per cent. of tannin and yields an extract which promises well as a substitute for cutch, to which, for dyeing purposes it is nearly or quite equal. The solid extract contains up to 65 per cent. tannin, making a good but dark red leather. _Ceriops Roxburghiana_, a somewhat larger tree, also growing in the Sunderbans, bark very similar in strength and character to the above. ONAGRACEÆ, the Œnothera Family. _Fuchsia excorticata_, the only deciduous tree of New Zealand. Contains 5 per cent. tannin. _Fuchsia macrostemma_, Chili. Yields Tilco or Chilco bark. Churco bark has been incorrectly attributed to this plant, but it is certainly derived from an _oxalis_, as stated by the Kew authorities. (Cp. von Höhnel, ‘Die Gerberinde,’ p. 125.) GUNNERACEÆ. _Gunnera scabra_ (_Pangue?_), _Pauke_, Chili. Used occasionally in the tanning of goat-skins. MYRTACEÆ.