A Text-book of Tanning / A treatise on the conversion of skins into leather, both practical and theoretical.

by H. R. Procter

Comptonia asplenifolia leaves, the sweet-fern of the United States, contain 9-10 per cent. of tannin.

Coriaria ruscifolia bark, the tutu of New Zealand, contains 16-17 per cent. of tannin.

Elæocarpus dentatus bark, the kiri-hinau of New Zealand, contains 21-22 per cent. of tannin. E. Hookerianus bark, the pokako of New Zealand, contains 9-10 per cent. of tannin.

Ephedra antisyphilitica, on the tablelands of Arizona and Utah, gives 11-12 per cent. of tannin.

Eucalyptus longifolia bark, the "woolly-butt" of Australia, contains 8·3 per cent. of tannic acid, and 2·8 of gallic. The "peppermint"-tree contains 20 per cent. of tannic acid in its bark. The "stringy-bark" (E. obliqua) gives 13¹/₂ per cent. of kinotannic acid. The Victorian "iron-bark" (E. leucoxylon) contains 22 per cent. of kinotannic acid, but is available only for inferior leather.

Eugenia Maire bark, the whawhako of New Zealand, contains 16-17 per cent. of tannin. E. Smithii bark, the "myrtle"-tree of Australia, contains 17 per cent. of tannic acid and 3-4 of gallic.

Fuchsia macrostemma root-bark is thin, brittle, and easily exhausted; it contains about 25 per cent. of a bright-red tannin, which has been successfully tried. It is the churco bark of Chili, which, however, is attributed by the Kew authorities to Oxalis gigantea.

Inga Feuillei pods, the pay-pay of Peru, contain 24 per cent. of an almost colourless tannin.

Laurus Peumo rind is used in Chili for tanning uppers.

Malpighia punicifolia bark, the naucite, or manquitta bark of Nicaragua, contains 20-30 per cent. of a very light-coloured tannin.