During a period of 1 month all medical practitioners were invited to notify cases of gonorrhoea. 123 were obtained including 108 men, 10 women and 5 children. Of 25 hospital cases 23 were acute and 2 chronic; 23 were all infected by prostitutes. Intercourse took place in hotels in 17, in private houses in 6 and elsewhere in 2; introduction was made by taxi-drivers in 11, hotel staff in 3, friends in 3 and not stated 8; places of contact were-bars 16, cabaret 1, streets 2, not stated 6. The author thinks that supervision of prostitutes would help but that contact tracing would be a better long-term policy.