. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 13. Botany; Botany. TIME IM 'DA^'S 3 July, 19361 CHRYSOSTOM—BENZENE DERIVATIVES AND Hoi 468 Physiological efjects.—The results listed in table 2 point to tlie fact that these solutions are nuich more toxic than anv of the others studied with the possible exception of * pyrogallol. Root tips became flaccid tJiifihtlv later than in the aromatic acids, but this softening was progressive, except in the weakest ani- line solution. Finally the whole root was affected. Laterals grew to some
. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 13. Botany; Botany. TIME IM 'DA^'S 3 July, 19361 CHRYSOSTOM—BENZENE DERIVATIVES AND Hoi 468 Physiological efjects.—The results listed in table 2 point to tlie fact that these solutions are nuich more toxic than anv of the others studied with the possible exception of * pyrogallol. Root tips became flaccid tJiifihtlv later than in the aromatic acids, but this softening was progressive, except in the weakest ani- line solution. Finally the whole root was affected. Laterals grew to some extent in the two weaker ani- line solutions but not at all in the strongest except in small aggregations at the top of the root. In methyl aniline solutions, laterals were inhibited imme- diately on formation. Tops showed a slight growth in aniline, but none in methyl aniline. The loss of turgidity in the latter solutions extended throughout the seedling's. ^UTIUE^T—Conductance. —The nutrient solution showed a decrease in conductance for the first five days, then an increase. This is in accordance with what might be expected, since the plants are con- stantly taking ions from the solutions. The increase at the end of the experiment was probably caused by unequal exchange of ions. HlliJrogcn-ion concentration. —Thc^^e solutions be- came progressively more acid, even those which were boiled to remove the carbon dioxide. Evidently the cause of acidity in the unboiled as well as the boiled solutions was not due entirely to carbon dioxide. Fhysioloqical effects.—In the lupines grown in the nutrient solution there was a plentiful growth of lateral roots and a ('ecided elongation of the primary root. Ilypocotyls elongated, the cotyledons opened, nnd there was growth of the epicotyl. l^xcept for the yellow color of the leaves, the ]ilants could be considered in good condition. The root>^ were turgid and the solutions clear at the end of the experiment. Dis
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