During the last two years two patients with hypokinetic appearance of Huntington's chorea--beginning in childhood--were investigated in the Neurological Univ.-Clinic of Vienna. Both of the patients descend from families with primary hyperkinetic Huntington's chorea in adult life. The problem of the early manifest hypokinetic form--when the family case history is not attended--are of special interest for the first symptoms can lead into false diagnosis. Therefore oftenly systematic treatment will be done at first just during the adult life, when already the complete picture of Huntington's chorea has appeared. From the point of eugenic deliberations it is very interesting for relatives of families with Huntington's chorea to be informed about the heredity, the most lately appearance of the disease and by the possiblity of anteposition.