Its existence partly is and partly is not intended by legislators; not intended, where they have noticed no defect in the law; intended, where they find themselves unable to define things exactly, and are obliged to legislate universally where matters hold only for the most part; or where it is not easy to be complete owing to the endless possible cases presented, such as the kinds and sizes of weapons that may be used to inflict wounds a lifetime would be too short to make out a complete list of these.