This opportunity of demonstrating before the Chicago Pathological Society a series of specimens illustratrating some recent studies upon the morbid anatomy of epilepsy is one for which I am grateful, and it is a pleasure to thank my friend, Dr. Hektoen, and his associate, Dr. Le Count, for their kindness in according me the privilege of bringing to your notice a subject in which I am intensely interested, and one which, since it involves the intelligent examination of gross pathologic objects, seems especially adapted for presentation before a society composed of experienced pathologists. Not to overstep the bounds of propriety incident to this particular meeting I shall endeavor to condense as much as possible what seems necessary to say in explanation of the objects submitted to your inspection. In the course of an investigation into the pathology of epilepsy, carried on since last July at the Ohio Hospital for Epileptics,