In a paper in this journal, van der Reyden [2] proposes a design in which control plots, one adjacent to each treated plot, are used to obtain adjustments for uneven distribution of insects in the soil. He discusses the application of his method to a soil insecticide experiment in rectangular lattice design. It unfortunately proved impossible to obtain the original data from van der Reyden's experiment, so that the present writer was unable to clear up certain points of ambiguity in the necessarily brief description, or to try different alternative methods of analysis. In this note attention is drawn to certain aspects of the method which do not seem satisfactory. Van der Reyden's method of analysis appears to consist of analyzing separately the results for the treated and control plots, obtaining the estimated treatment effects and residuals for each plot. Two corrections are then applied to the observed value for each treatment plot, viz: