Having availed myself, when recently in Paris, of the opportunity afforded of visiting the Salpêtrière, I have made a few notes of what I witnessed in the service of M. Charcot, although, from the shortness of my visit, I was not in a position to do justice to the subject which has recently attracted so much attention—the influence of metals in anæsthesia, hystero-epilepsy, &c. I can do little more than record facts, and suspend my judgment as to their nature and the explanation which further investigation will give of them.