SIDEROSIS OF THE GLOBUS PALLIDUS IN A MONKEY.

Abstract

nerve cells surrounding the deposits have undergone various amounts ofdestruction. Silversections show that the plexus of nerve fibres is less dense than in the normal globus pallidus, and many of the fibres show degenerative changes such as frag-mentation and irregular thickenings. The deposits were first thought to be entirely of a calcareous nature, but they were found to give a strong positive reaction for iron in preparations treated with hydrochloric acid and potassium ferrocyanide. In these preparations the substance of the globus pallidus itself also stains a more intense blue than normal.