Solitude in imprisonment, with proper profitable labour and a space diet : The most humane and effectual means of bringing malefactors, who have forfeited their lives, or are subject to transportation, to a right sense of their condition; with proposals for salutary prevention: and how to qualify offenders and criminals for happiness in both worlds, and preserve the people, in the enjoyment of the genuine fruits of liberty, and freedom from violence. By Jonas Hanway, Esq.