Von Storch has induced headache by the sudden intravenous injection of minute amounts of histamine phosphate in three groups of persons—the first group consisting of those subject to migraine, the second group composed of those suffering from chronic recurrent non-migraine headache, and the third group consisting of those not subject to headache. He has found that in persons subject to migraine the headache produced by histamine is frequently similar in character to their habitual headache (though bilateral), while in those subject to chronic recurrent non-migraine headache the experimental headache is only occasionally similar to their usual headache. From the evidence presented by him, linking migraine and histamine, the latter would appear to be a useful drug for distinguishing migraine from other forms of recurrent headache. Using a technique similar to his, experiments were performed at this centre to determine the relation of histamine headache to post-contusional and psychogenic headaches, and the results are worth recording.