In the report of the International Congress of Mental Medicine, which appeared in this Journal in October, 1878, I referred briefly to the discussion which took place upon the provision made, or proposed to be made, in France for criminal lunatics and lunatic criminals. I was not, however, able to give at that time the conclusions arrived at in the debate, nor did space allow of my giving an account of the Quarter at Gaillon for insane convicts. I am now able to supply both omissions, and believe that the information conveyed as to what is being done across the Channel will be of interest to those in Great Britain and Ireland who are concerned directly or indirectly with the important subject of criminal lunacy.