Chapter XVIII Vegetable Tanning Materials
Distribution of tannin in plants — Structure of barks — Botanical list of important tanning materials PAGE 242
Chapter XIX The Chemistry of the Tannins
Sources of tannins — General qualities of tannins — Chemical constitution — Catechol-and pyrogallol tannins — Catechins — Tendency of Catechol tannins to darken with light — “Physiological” and “pathological” tannins — Presence of mordant colouring matters PAGE 294