Notwithstanding the exceedingly rich literature on trichinosis, few contributions treat of the neurologic or neuropathologic phase of this infection, and practically none deals with the changes that result from the presence ofTrichinaein the brain tissues. Only Frothingham,1who succeeded in demonstrating these worms in the brain, gives a superficial description of the concomitant changes. These were rather meager—"slight hemorrhages without cellular reaction and areas of cellular infiltrations consisting chiefly of endothelial and neuroglia cells with an occasional leukocyte and lymphocyte. In such an area part of a trichina embryo sometimes appears outside the vessels." The case here recorded is thus the second in the literature in which the invasion of the brain byTrichinalarvae has been demonstrated together with its effect on the central nervous system. REPORT OF A CASE History. —A boy, aged 14, admitted Nov. 30, 1924, to the medical service (Dr. Weatherson)