The occurrence of appendicitis during the course of other conditions is apt to be overlooked. It is not common, as those who are constantly looking for appendicitis would have us think. Hilton has observed 29 cases of appendicitis which occurred during the puerperium. These occurred within from ten days to eight weeks after labor. A few cases are reported which began with the beginning of the labor. It is possible that these cases have been classed in the past with septic metritus and have been so treated. A careful differential diagnosis must be made.