SummaryThe indications for two‐stage prostatectomy are set out.The chief clinical differences between acute and chronic retention are discussed.Practical points concerning in‐dwelling catheter drainage are raised.The constitutional signs of chronic retention are emphasised.Some details are given in the treatment of chronic retention.Emphasis is given to the danger of prostatectomy when infection is marked.The danger of primary hzemorrhage in certain cases o f prostatectomy is stressed.Certain circulatory warnings are considered in relation to prostatectomy.The necessity is emphasised for being sure that the full benefit of the pre‐liminary cystostomy is obtained before proceeding to the second operation in two‐stage prostatectomy.Attention is called to the danger of prostatectomy in certain long‐standing cases of suprapubic c