18th-century British criminology had emphasized severe punishment. Slowly capital punishment was replaced by transportation, first to the American colonies and then to Australia, and, especially, by long-term incarceration in newly built prisons. As one historian points out, "Public and violent punishment which attacked the body by branding, whipping, and hanging was giving way to reformation of the mind of the criminal by breaking his spirit, and encouraging him to reflect on his shame, before labour and religion transformed his character." Crime rates went up, leading to calls for harsher measures to stop the 'flood of criminals' released under the penal servitude system. The reaction from the committee set up under the commissioner of prisons, Colonel Edmund Frederick du Cane, was to increase minimum sentences for many offences with deterrent principles of 'hard labour, hard fare, and a hard bed'. As the prisons grew more numerous, they became more depraved. Historian S. G. Checkland says, "It was sunk in promiscuity and squalor, jailers' tyranny and greed, and administrative confusion." In 1877 du Cane encouraged Disraeli's government to remove all prisons from local government; he held a firm grip on the prison system till his forced retirement in 1895. By the 1890s, the prison population was over 20,000.