Original (inglés)

TRANSLATOR'S PREFACE Doctor Grasser hardly needs an introduction to the leather trade of this country in its scientific aspect, but if one be sought for, none could serve the purpose better than a translation of the book herewith presented to the British-speaking public. Viewed with curiosity from their start, the synthetic tannins needed—like many other important discoveries—an extreme emergency for the purpose of showing their value. The Great War provided the opportunity of which