After reading the somewhat meagre discussion which followed the reading of Dr. Thomas Ireland's very interesting paper before the Section of Psychology at the 61st Annual Meeting of the British Medical Association,∗ it occurred to me that your readers might take some interest in a paper on the connection between hemp drugs and insanity in Bengal. The Hemp Drugs Commission is now sitting, and my paper will consist mainly of the evidence already given to me, in the shape of a report, to that Committee. To avoid unnecessary prolixity, I will first of all refer your readers to an excellent report by Surgeon-Captain David Prain, I.M.S.,† which was published a short time ago by the Bengal Government. This report deals fully with the botanical and economic side of the question, and gives also a good resumé of the chemistry of cannabis sativa.