THIS paper is an atteimpt to elucidate the common causes of recurrent abdominal pain in childhood of more than a transient nature, and consists of an investigation of all cases admitted to the Belfast Hospital for Sick Children during the years 1934, 1935, and 1936, whose abdominal symptoms were of such a character as to be considered worthy of laparotomy. There are 134 cases in all, 130 have b...