But when the comparative examples adduced are of no less than five successive cycles, and the result gradually and constantly progressive in the same direction, the relation of facts to each other is determined beyond all ground for dispute, namely, that the number of these crimes has diminished in consequence of the diminution of the number of executions. More especially when it is also remembered that it was immediately after the first of these cycles of five years, when there had been the greatest number of executions and the greatest number of murders, that the greatest number of persons were suddenly cast loose upon the country, without employ, by the reduction of the Army and Navy; that then came periods of great distress and great disturbance in the agricultural and manufacturing districts; and above all, that it was during the subsequent cycles that the most important mitigations were effected in the law, and that the Punishment of Death was taken away not only for crimes of stealth, such as cattle and horse stealing and forgery, of which crimes corresponding statistics show likewise a corresponding decrease, but for the crimes of violence too, tending to murder, such as are many of the incendiary offences, and such as are highway robbery and burglary. But another return, laid before the House at the same time, bears upon our argument, if possible, still more conclusively. In table 11 we have only the years which have occurred since 1810, in which all persons convicted of murder suffered death; and, compared with these an equal number of years in which the smallest proportion of persons convicted were executed. In the first case there were 66 persons convicted, all of whom underwent the penalty of death; in the second 83 were convicted, of whom 31 only were executed. Now see how these two very different methods of dealing with the crime of murder affected the commission of it in the years immediately following. The number of commitments for murder, in the four years immediately following those in which all persons convicted were executed, was 270.
"In the four years immediately following those in which little more than one-third of the persons convicted were executed, there were but 222, being 48 less. If we compare the commitments in the following years with those in the first years, we shall find that, immediately after the examples of unsparing execution, the crime increased nearly 13 per cent., and that after commutation was the practice and capital punishment the exception, it decreased 17 per cent.
"In the same parliamentary return is an account of the commitments and executions in London and Middlesex, spread over a space of 32 years, ending in 1842, divided into two cycles of 16 years each. In the first of these, 34 persons were convicted of murder, all of whom were executed. In the second, 27 were convicted, and only 17 executed. The commitments for murder during the latter long period, with 17 executions, were more than one half fewer than they had been in the former long period with exactly double the number of executions. This appears to us to be as conclusive upon our argument as any statistical illustration can be upon any argument professing to place successive events in the relation of cause and effect to each other. How justly then is it said in that able and useful periodical work, now in the course of publication at Glasgow, under the name of the Magazine of Popular Information on Capital and Secondary Punishment, 'the greater the number of executions, the greater the number of murders; the smaller the number of executions, the smaller the number of murders. The lives of her Majesty's subjects are less safe with a hundred executions a year than with fifty; less safe with fifty than with twenty-five.'"
Similar results have followed from rendering public executions more and more infrequent, in Tuscany, in Prussia, in France, in Belgium. Wherever capital punishments are diminished in their number, there, crimes diminish in their number too.