An experiment to determine the distribution of methyl bromide gas in a pyramidshaped stack of bagged decorticated groundnuts in Kano, Nigeria, is described. I t was considered that, in view of the poor distribution of gas observed, a pyramid-shaped stack is probably unsuitable for a fumigation in which injection of the gas a t a single point is used. 10 layers of the pyramid during April (Table 111), a c.t. product of 65 mg. h. methyl bromide