Case I.?A Hindu male, aged 35, with old spastic paraplegia, very healthy, muscular and robust, was given an ounce and a half of bismuth carbonate with his customary full diet, consisting of rice, dal, fish and vegetables, at 11-30 a.m. At 12 noon,?the stomach was full and of normal shape and size. At 3 p.m.,?stomach half full; part of meal in small intestines. At 5-30 p.m.,?about one-eighth of the total meal still left in stomach : meal reached descending colon. Case II.?A healthy-looking, tall, well built Hindu male, aged about 40, old paraplegia. Full diet as above given at 11-30 a.m. with 1| ounce of bismuth. At 12 woon,?stomach full : healthy. At 3 p.m.,?stomach half full : part of meal at splenic flexure of the colon. At 5-30 p.m.,?about one sixth of the meal still in stomach : rest had passed on. Case III.?A well-nourished, healthy boy. Hindu, aged 12: slight weakness in one leg, resulting from infantile hemiplegia. Full diet with bismuth as above given at 11-30 a.m.