General applications of naphthalene acetamide and of phenylacetic acid in concs. of 10-10 to 10-4 in diluted nutrient soln. were made to growing tomato plants grown in 2 soils, one high in organic matter, pH 7.3, the other lower, pH 7.8. In every case there was less dry wt. produced by the treated plants than by the controls, the most marked decrease being in the naphthalene acetamide cultures at 10-4. There were no constant differences in extractable auxin content of any of the soil samples at the end of the expt.