>>>>> "N" == Nicolaj Soendberg-Madsen <nsoe03 / miba.auc.dk> writes: N> puts ta.to_s This line work, but probably you have written puts ta and ruby has not called Time_stamped_array#to_s, no ? N> However this last call seems to invoke to_s in the super class (Array) #puts has a special case for object which respond to #to_ary (like Array) Guy Decoux