SENSORIMOTOR NEUROLOGY

if neuronic alterations have supervened. The author has met with the same type of granular cells in a case of medulloblastoma. Every glia-cell therefore probably has a natural aptitude for phagocytosis and for transformation into lipoid substances. Wallenberg has made a special research into the origin of the so-called giant glia-cells. Two different types of such cells exist: (1) Cells containing a well-formed nucleus nearly always situated in the neighbourhood of bloodvessels, and (2) monster glia-cells containing diffuse chromatin and always situated in the neighbourhood of necrotic tissue. He is inclined to the opinion that a giant glia-cell is produced as a result of an irritation provoked by the imbedding of a foreign body and may be compared to the origin of giant cells in other kinds of tissue. M.