Volvulus is not a very common condition. In large general hospitals the incidence is about one case or two cases a year. It has occurred here at Prestwich eleven times from 1923 to 1927, and comparing the huge population served by a general hospital with the number resident in a mental hospital the frequency of the condition is out of all proportion. This fact is the reason for the present paper, giving some account of the condition and stating the factors that were present in the cases. Whether certain types of mental cases are liable to develop this pathological state is a matter which will be discussed, and about which the experience of others will be welcome.