The application of electricity to the treatment of various diseases of the brain and spinal cord has for a number of years been a regular method of treatment with some of our best known neurologists and electro-therapeutists, and the value of such treatment, when rightly administered, is now questioned by very few advanced students in these departments. It is not, however, so well recognised that in diseases of the brain and spinal cord, where the mind is seriously affected, the electrical treatment is also indicated. In some of the asylums of England, United States, and Germany, electricity is now, and for some time has been used as an adjunct to other remedies for the treatment of different forms of insanity; but with a few exceptions the treatment is not systematically carried out, and, partly through ignorance of the methods of application, partly through want of sufficient medical assistance to supervise the necessary details, the results have not been entirely satisfactory, and the cases have not been fully recorded.