Corn is frequently cultivated on soil previously used for cotton. Cotton plantings usually receive heavy applications of BHC for insect control, what might lead to an accumulation of the insecticide in the soil. An attempt was made to verify whether varying amounts of BHC added to a sandy soil in Mitscherlich pots would injury corn plants. The amounts added were calculated on an area basis to correspond to those received by the land at the end of 1, 2, 3, 4 and 5 years of cotton cultivation when BHC is applied at the yearly rate of 108 kg per hectare. Other types of soil were not used in this experiment because the toxic effects of this insecticide seem to be more serious on sandy soils. Other techniques employed in this work were exactly the same described in a previous paper (1). The experiment was terminated one month after sowing and the weights of the plant tops and roots were determined. The soil from the pots was passed through a sieve after harvesting, returned to the pots and left undisturbed for one year. Corn was then planted a second time on the same soil. In the first planting, dose 1 had no injurious effect on plant growth, but the heavier doses depressed it severely. In the second planting only doses 4 and 5 showed injurious effects, but injury was less severe than that in the first planting. The results seem to indicate that there is practically no risk that residual BHC in the soil from a previous cotton planting that received standard applications of the insecticide will injury corn plants raised on the same land the following year.