In 1727, Petit1 first observed the influence of the cervical sympathetic nerve on the eye. Since that time, the effects of paralysis or irritation of the sympathetic nerves have commanded much study, particularly in the interval following the experiments of Claude Bernard, and during the World War. Attention has been focused on the cervical sympathetic system, mainly because the ocular effects of changes in the cervical sympathetic nerves are so striking and obvious. The consequences of alterations of the nerves or ganglia in other parts of the sympathetic system have received much less general attention, though they must be fully as important. A number of cases are on record in which injuries of the brain, cord or peripheral nerve trunks have occurred, with various sequelae, which were probably due to sympathetic involvement. Chief among these are the interesting observations of André-Thomas,2 who has studied such cases on an