The velocity of propagation of the myoelectric complexes was studied in dogs after a single and a double transection of the jejunum. Results were compared with those obtained when a 50 cm segment of the bowel was isolated or removed. After a single transection, the passage through the anastomosis occurred with a delay of 15 min. The delay at this level was more than doubled when a second transection was performed 50 cm aborally, the total delay being then 65 min for the passage through the two anastomoses. After removal or isolation of a 50 cm jejunal segment, the delay was reduced to 45 and 49 min respectively.