The action of some chemical growth inhibitors on healthy and tumor tissue of plants.

test were retested over a suitable range of concen trations to determine their degree of activity. Third, in vitro tests were performed with bacteria free crown-gall tissues and healthy tissues to de termine whether differences existed in the sensi tivity of these tissues to the growth inhibitors. Fourth, where growth inhibition was considered to be due to the displacement of an essential metabolite, experiments were conducted to de termine whether the inhibition could be reversed by the metabolite in question. Histological studies were also performed to determine the effects of the inhibitory substances on the structure of the