Dr. D.M.W. Anderson, of the Department of Chemistry, West Mains Road, Edinburgh EH 9 3JJ, Great Britain, started work on plant gums some 12 years ago. Of course he has to rely on samples sent to him as most gums come from tropical forests, hence this request. Though my experience learns me to be pessimistic about results of requests, I will go on with the good work of stimulating collaboration. It cannot be sufficiently emphasized that there is for progress of science a desperate need for this cooperation between laboratories situated in the temperate zone and workers in the tropics and subtropics.