Dr. Clouston explained that he was the spokesman of Drs. Middlemass and Robertson, who had made almost all the sections and had supervised the micro-photography. He explained that as yet micro-photography had many disadvantages owing to the very delicate structure of the brain and the high powers that had to be used, as well as the difficulty in photographing many of the aniline stains. In the case of some of the sections more than six slides had been made before a satisfactory photograph was got.