A heavy blow or a fall may so jar the system as to produce disturbance in the brain and nervous system, and through them affect other organs. In these cases the appropriate remedies are Arnica and Belladonna. Arnica should be given, where some part of the body may have been bruised by a fall or blow, and Belladonna, where there are indications of cerebral disturbance, such as convulsions, giddiness, or pain in the head, and stupor. A dose should be taken, where the symptoms are violent, every hour, increasing the intervals, as they subside to three or four hours.