“…Falling to the ground without immediately discernible reason has been ascribed to many causes-such as, atherosclerotic ver-Derbyshire Royal Infirmary, Derby tebrobasilar insufficiency (Williams and Wilson, 1962;Kubala and Millikan, 1964), cervical spondylosis with constriction of the vertebral artery (Sheehan et al, 1960), tumours in the region of the foramen magnum (Kremer, 1958), colloid cyst of the third ventricle (Kelly, 1951), menopausal muscular dystrophy (Shy and McEachern, 1951), congenital heart disease (Evans and Bremner, 1961), myxoedema (Jellinek, 1962), vestibular disease (J. N. Blau, personal communication, 1972), progressive supranuclear palsy, (Steele et al, 1964), old age (Sheldon, 1960), epilepsy (Lennox and Lennox, 1960), and subconscious guilt (Leuba, 1950). Nevertheless, as Kremer (1958) pointed out, such falls usually remain unexplained.…”