The literature dealing with the history of dementia paralytica usually credits the first description of the pathology of the disease to John Haslam, the first satisfactory recognition of the disorder to A. L. J. Bayle and the relationship of the disease to syphilis to Esmarch and Jessen. These studies seem to be the three pillars on which the subsequent development of knowledge concerning this disease has been built. It is our purpose to present the material contributed by these authors to the knowledge of the disease and to give a brief critical summary. At the outset it may be stated that the work of Bayle far transcends in importance that of the other two contributors. Indeed, it is doubtful whether Haslam's work would be given much consideration were it not for nationalistic pride.
HASLAM'S CASE FROM HIS "OBSERVATIONS ON INSANITY"
John Haslam's contribution to the subject is contained in his