the brain. Its structure and use are not to fully known as some other parts of the body, and different authors consider it in various manners. However, according to the observations of those most famed for their accuracy and dexterity in anatomical inquiries, its general structure is as given in Anatomy, p. 132.

Dr Hunter observes, that the principal parts of the medullary substance of the brain in idiots and madmen, such as the thalami nervorum opticorum, and medulla oblongata, are found entirely changed from a medullary to a hard, tough, dark-coloured substance, sometimes resembling white leather.