terrifying dreams, tinnitus aurium, flashes of light, difficulty of thought, and depression. This terminated in a few days in a delirium characterized by anxiety and visual hallucinations. Other cases showed a more marked depression and stupor, sometimes alternating with delirium and violent excitement, accompanied by hallucinations and speech defects. Amaurosis and convulsions are spoken of frequently as common symptoms. Conditions similar to general paresis have been noted by various observers. There have been very few contributions to medical literature on the subject of psychoses caused by arsenic. In discussing forms of poisoning due to that drug Edsall expressed the opinion that "marked psychic symptoms are unusual." Casamajor makes the statement that "in very severe cases memory disturbances have been noted, and in some the typical Korsakow polyneuritic psychosis." According to Oppenheim a rise of temperature associated with a delirium may be observed at the onset of arsenical poisoning and may also occur later in the disease. Psychoses due to arsenic were not referred to by Krafft-Ebing, Arndt, Schüle, Ziehen or Kraepelin. Edsall[239] mentions as the symptoms of chronic mercurial poisoning, headache, restlessness, mental depression and weakness. Most striking features are tremors and a peculiar emotional disturbance referred to as "erythism." Tremors of the lips and facial muscles are common and speech disturbance and choreiform movements have been noted. Symptoms suggesting neurasthenia and hysteria have also been reported. Naunyn has described excitements due to mercury characterized by anxiety and fears with hallucinations and sleeplessness. He also speaks of manic attacks, depressions and mental deterioration as associated conditions. Argyria or chronic silver poisoning is said to be accompanied often by a marked sensitiveness and occasional episodes of actual depression due to the discoloration and pigmentation of the face.