“Cloud-drift” is a term used to describe a comparatively new method of distributing poison for boll weevil control. By this method part at least of the dust cloud is thrown relatively high in the air above the cotton plants, and this cloud then drifts slowly across the field giving a fairly even distribution pf poison over a number of rows beyond those covered directly by the dusting machine. The rate of dust discharge is increased so that the actual amount of poison applied per acre is practically the same as by the usual methods of application. At the Louisiana Experiment Station in 1925 a test was made of the “cloud-drift” method in comparison with regular methods of dusting. The regular dusted areas included two plats treated with hand gun, two plats dusted with a Root 2-row traction duster, and one plat dusted with a Niagara 3-row duster. The average yield of these five regularly dusted plats was 1282 pounds of seed cotton per acre. The average yield on three check areas associated with these plats was 781 pounds. The apparent gain from regular dusting was, therefore, 501 pounds of seed cotton per acre or a gain amounting to 64% of the average check yield. In comparison with the foregoing the cloud-drift dusted plat, located in the middle of this entire series, with an area of approximately one acre and with undusted check areas on each side, gave a yield of 1380 pounds of seed cotton per acre. This shows an apparent gain of 599 pounds of seed cotton per acre or a gain amounting to 77% of the average check yield. This difference amounting to 98 lbs. of seed cotton per acre in favor of the cloud-drift area is more than could reasonably be attributed to any differences in stand or fruiting capacity. It appears that the cloud-drift method will be limited in usefulness by the narrow range of atmospheric conditions within which it can be applied, but that when these conditions do occur and the direction of the drift is across the rows, advantage may be taken of the cloud-drift method to save at least one-half the time required for making the application by the usual every row treatment.