Since the introduction of surgical methods of treatment of athetosis and related diseases1 the problem of precise and definite diagnosis has become an important one. Encephalography has therefore been performed in a series of 13 cases of the athetoid syndrome in one or another form, in most of which the patient was a candidate for operation. The results have been compared with the findings in 2 cases in which also chordotomy was done and in which on review the disease appears to belong in a different category. Observations were also compared with those in a group of 6 cases of various conditions in which the encephalographic appearance resembled that seen in cases of the athetoid syndrome but in which abnormal movements did not occur.
There are comparatively few records of the results of encephalography in cases of this type. Goodhart, Balzer and Bieber2 reported 3 cases of Wilson's