I will take for the subject of this letter, the effect of Capital
Punishment on the commission of crime, or rather of murder; the only
crime with one exception (and that a rare one) to which it is now
applied. Its effect in preventing crime, I will reserve for another
letter: and a few of the more striking illustrations of each aspect
of the subject, for a concluding one.

The effect of Capital Punishment on the commission of Murder.

Some murders are committed in hot blood and furious rage; some, in
deliberate revenge; some, in terrible despair; some (but not many)
for mere gain; some, for the removal of an object dangerous to the
murderer's peace or good name; some, to win a monstrous notoriety.

On murders committed in rage, in the despair of strong affection (as
when a starving child is murdered by its parent) or for gain, I
believe the punishment of death to have no effect in the least. In
the two first cases, the impulse is a blind and wild one, infinitely
beyond the reach of any reference to the punishment. In the last,
there is little calculation beyond the absorbing greed of the money
to be got. Courvoisier, for example, might have robbed his master
with greater safety, and with fewer chances of detection, if he had
not murdered him. But, his calculations going to the gain and not
to the loss, he had no balance for the consequences of what he did.
So, it would have been more safe and prudent in the woman who was
hanged a few weeks since, for the murder in Westminster, to have
simply robbed her old companion in an unguarded moment, as in her
sleep. But, her calculation going to the gain of what she took to
be a Bank note; and the poor old woman living between her and the
gain; she murdered her.