Abstract
SUMMARY Resin‐containing cells can be distinguished microscopically in sections of Denis roots. Only these cells respond to Durham's test. Rotenone first occurs in small groups of cells in the secondary cortex opposite the protoxylem, when the plant is about 6 weeks old. Thereafter it gradually spreads in scattered groups throughout the xylem parenchyma and cortex. Starch and rotenone do not occur in the same cell; they occur in mutually exclusive groups. It is probable that, in a mature root, all the xylem parenchyma contains either starch or rotenone. The toxic substances other than rotenone probably occur in the same cells as rotenone. The rotenone‐containing cells are apparently morphologically unspecialized.
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