Much of the financial support came from the City of London. The Lord Mayor, William Taylor Copeland, was a grateful patient of Salmon's and became the first President. Another benefactor was Charles Dickens, who blamed his need for Salmon's surgical attentions on 'too much sitting at my desk'! There was an overwhelming need for such an institution giving specialist treatment free of charge to London's poor. Therefore, in 1838, when the number of patients had trebled, Salmon moved to larger premises at 38 Charterhouse Square, where there were fourteen beds and more space for treating out-patients. Thirteen years later, a site in City Road was purchased from the Dyers' Company and the almshouses that occupied it were converted to a 25-bed hospital. This was opened on St Mark's Day, 25 April 1854, and took the name of St Mark's Hospital for Fistula and other Diseases of the Rectum.