Psychopathology

section. When the cerebrum is cut the anterior portion of the corpus callosum is seen to be rather sharply divided into three lamin.T, of which the dorsal and ventral are normal in colour and consistency, while the middle is softer and pinkish or greyislh in colour. This condition of the middle layer is sometimes present throughout the corpus callosum. In many cases, in the posterior parts of the corpus callosum the abnormal area disappears in the region of the midline, leavilng symmetrical lesions on the two sides, extending backwards for varyinig distances. The abnormal area usually stops abruptly at or near the lateral margins of the corpus callosum. The soft, pinkish lamina ordinarily occupies about two-thirds of the dorsoventral extent of the corpus callosum. As regards aetiology, whenever the clinical history has been obtained it has been noted that the patient was a heavy drinker, either of wine or of wi11e and distilled liquor. 1R. -M. S.