Free Auxins and Free Tryptophane in the Strawberry.

It has been previously demonstrated (15) that the growth of the strawberry receptacle is regulated by the achenes. This control is exerted through substances which are active in the Avena test, a standard test for auxins. The exact identity of these natural auxins, however, had not been investigated. The purpose of this paper is to report further experiments on the production of auxins by strawberry achenes, on the level of free tryptophane, a generally presumed raw material in the genesis of natural indolic auxins, and on the separation of the auxins of the strawberry by paper chromatography.