Die Harze: Die botanischen und chemischen Grundlagen unserer Kenntnisse über die Bildung, die Entwicklung und die Zusammensetzung der pflanzlichen Exkrete

Abstract

THE natural resins continue to increase in economic importance notwithstanding the competition from synthetic materials, and they are the subject of monographs in several languages. Prof. Tschirch is one of the pioneers in the field and his book has long been a standby for those seeking information. This, the third edition, has been completely rewritten with the assistance of E. Stock; it covers, as explained in the sub-title, the botanical and chemical basis of the knowledge of the formation, development and composition of the plant excretions. The volume before us contains the general principles of the subject, subsequent volumes being devoted to the individual resins; it is divided into morphological, physical and chemical sections following a lengthy chapter on the formation of the exudates. This first chapter is copiously illustrated both with micro scope drawings of cell structure and with photo graphs of the trees showing the method of col lecting; it includes one fine plate in colours illustrating the fluorescence analysis of balsams and resins in the quartz lamp. The thorough and exhaustive nature of these sections which charac terise the resins are exemplary.

Die Harze: Die botanischen und chemischen Grundlagen unserer Kenntnisse über die Bildung, die Entwicklung und die Zusammensetzung der pflanzlichen Exkrete.

Bearbeitet von A. Tschirch und Erich Stock. Dritte umgearbeitete Auflage von A. Tschirch: Die Harze und die Harzbehälter. Band 1. Pp. xv + 418. (Berlin: Gebrüder Borntraeger, 1933.) 47.25 gold marks.