petitioned the senate of the University of Cambridge to provide examinations for women; the Cambridge Higher Examination for women was introduced the following year. Jordan notes that "much of the credit for this should go to Anne Clough, but ... Butler played a very influential part ... of the campaign." At the time British law relating to marriage was based on the legal doctrine of coverture, in which a woman's legal rights and obligations were subsumed by those of her husband upon their matrimony. By law a woman had no separate legal existence, and all her property became her husband's; divorce initiated by a woman was difficult and complicated. In April 1868 Butler and fellow suffragist Elizabeth Wolstenholme set up and became joint secretaries of the Married Women's Property Committee to pressure parliament into changing the law. Butler remained on the committee until the campaign was successful, with the passing into law of the Married Women's Property Act 1882. First attempt to repeal of the Contagious Diseases Acts; 1869–1874 In 1869 Butler became aware of the Contagious Diseases Acts. They had been introduced in 1864, 1866 and 1869 to regulate prostitution in an attempt to control the spread of venereal diseases, particularly in the British Army and Royal Navy. The Acts authorised the police to detain women in specific areas considered to be prostitutes—no evidence was needed, other than the police officer's word. If a magistrate agreed, women were given genital examinations. If women were suffering from sexually transmitted diseases, they were held in a lock hospital until the condition was cured. If they refused to be examined or hospitalised they could be imprisoned, often with hard labour. Units of plain-clothed policemen specialised in arresting suspected prostitutes; according to Jordan, the officers were "hated for their surveillance and harassment of prostitutes and working-class women ... who they treated with little regard for their legal rights". Women who were subjected to the examination found their names and reputations affected and, according to the historian Hilary Cashman, "the Acts had the effect of turning them to prostitution by barring respectable ways of life to them". In September 1869 Wolstenholme met Butler in Bristol to discuss what could be done about the Acts. The National Association for the Repeal of the Contagious Diseases Acts was founded that October, but excluded women from its membership. In response, Wolstenholme and Butler formed the Ladies National