1I am greatly indebted to Dr. G. A. Watson in connection with this case; first for allowing me to use his post-mortem notes, and secondly for assistance in the preparation and examination of the microscopical sections. I have also to thank Dr. Mott for placing the material at my disposal, and Dr. Robert Jones and Dr. Pugh for enabling me to use the clinical notes. For the opinions expressed in this paper, I alone am responsible