In some cases, in which the blood is poisoned by containing a large quantity of purulent matter, as, for instance, in the purulent diathesis, or pyaemia, of lying-in women, the brain becomes the seat of metastatic purulent deposits. Under these circumstances, other organs and tissues are always found to have undergone the same morbid process. A marked characteristic of these deposits in the brain is their great number. They occur in all parts of the organ; but they are most commonly found deep in the substance of the cerebral hemispheres. As in other parts of the body, they are developed from a circumscribed dark-red plug or core, and they form collections of pus or of ichor, the usual size of which ranges between that of hempseed or a pea and that of a bean.