A Caltech Library Service

The wound hormones of plants II. The isolation of a crystalline active substance

English, James, Jr. and Bonner, James and Haagen-Smit, A. J. (1939) The wound hormones of plants II. The isolation of a crystalline active substance. Proceedings of the National Academy of Sciences of the United States of America, 25 (7). pp. 323-329. ISSN 0027-8424.

See Usage Policy.


Use this Persistent URL to link to this item:


The existence of plant "wound hormones" has been recognized since the formulation of the wound hormone concept by Wiesner (1) and the demonstration by Haberlandt (2) of the diffusible nature of the active principles. It was shown by these early investigators that there are formed or liberated at injured surfaces of plant tissues water-soluble substances which are capable of evoking renewed growth activity in mature uninjured cells or tissues. In the present paper the isolation from plant material of a crystalline substance possessing typical "wound hormone" activity will be described.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:© 1939 by the National Academy of Sciences. Communicated June 2, 1939. Report of work carried out with the cooperation of the Works Progress Administration, Official Project Number 665-07-3-83, Work Project Number 9809. The authors are greatly indebted to Elvin Waddell for his capable assistance in the execution of the bio-assays.
Issue or Number:7
Record Number:CaltechAUTHORS:ENGpnas39
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10925
Deposited By: Tony Diaz
Deposited On:19 Jun 2008
Last Modified:03 Oct 2019 00:14

Repository Staff Only: item control page