Abraham Myerson

Progress in Neurology

or diminishing on voluntary movement with attention, e.g. tremor in paralysis agitans; (2) Tremor occurring only on voluntary movement and ceasing during repose, e.g. disseminated sclerosis; (3) Tremor which occurs during repose, but is much greater during voluntary movement, as in most cases of alcoholic, senile, asthenic, simple and hysterical tremor. Hereditary tremor is occasionally observed?it occurs in families, and is the only abnormal symptom. The tremor may affect various voluntary muscles, and occasionally all the muscles, but is most frequently met with in the arms, less frequently in the legs, trunk, neck, lower jaw, and tongue. The type of the tremor is different in different families; in some cases it is a coarse intention tremor, not very frequent, of almost convulsive character, and eventually complicated by convulsive contractions in single groups of muscles. In other cases it is a fine rhythmical oscillating tremor which can be checked by voluntary effort. Tremor may be associated with gross lesions of the brain, e.g. hemiplegia, tumours of the optic thalamus, crus, pons, corpora quadrigemina, and cerebellum. Cases are occasionally met with in which tremor has been present since early infancy. Thus, in a boy, aged 13, there was a fine, tremor of the hands, which was stated to have been

The Progress of Neurology

Insanity in liead Workers.?From a large lunacy experience Jones 11 comes to tlie following conclusions as to the existence of lunacy in lead workers. Lead poisoning is a contributory factor in the causation of insanity, and there is a higher average number of general paralytics than in others of the population. There is a tendency in these cases to cardiac, renal, and arterial degeneration, with complications due to syncopal or epileptiform fits. Most cases present marked signs of anaemia and ill-health, with unsteadiness of gait and general impairment of muscular strength, and very frequently a history of temporary failing vision. The mental symptoms may be grouped among