Light Intensity and the Nitrogen Hunger Period in the Manchu Soybean.

amounts of auxin rather than absolute ones are being considered the auxin amounts may be more conveniently expressed in arbitrary units. The above-described method has been used for the determination of the distribution of the auxin concentrations in maize, Avena and pea seedlings and also by Yin (unpublished as yet) to study the auxin distribution of Papaya leaves, and has proved to be reliable and to give reproducible results (Avena experiments of table 1). Figure 1 shows the auxin distribution in gammas hetero-auxin equivalents per liter. Note the high auxin concentration in the basal part of the primary leaves of Avena and maize and also the relatively high concentration in the basal parts of those seedlings. The concentration in the lateral buds of the pea seed' ling is higher than that in the adjacent stem tissue. A detailed paper discussing the relation between growth and the auxin distribution in maize and Avena seedlings and also the relation between auxin concentration and bud inhibition in the pea seedlings will be submitted to The Botanical Gazette.