A vital conception of Evolution would have taught Weismann that
biological problems are not to be solved by assaults on mice. The
scientific form of his experiment would have been something like this.
First, he should have procured a colony of mice highly susceptible to
hypnotic suggestion. He should then have hypnotized them into an
urgent conviction that the fate of the musque world depended on
the disappearance of its tail, just as some ancient and forgotten
experimenter seems to have convinced the cats of the Isle of Man. Having
thus made the mice desire to lose their tails with a life-or-death
intensity, he would very soon have seen a few mice born with little or
no tail. These would be recognized by the other mice as superior
beings, and privileged in the division of food and in sexual selection.
Ultimately the tailed mice would be put to death as monsters by their
fellows, and the miracle of the tailless mouse completely achieved.

The objection to this experiment is not that it seems too funny to be
taken seriously, and is not cruel enough to overawe the mob, but simply
that it is impossible because the human experimenter cannot get at the
mouse's mind. And that is what is wrong with all the barren cruelties of
the laboratories. Darwin's followers did not think of this. Their only
idea of investigation was to imitate 'Nature' by perpetrating violent
and senseless cruelties, and watch the effect of them with a paralyzing
fatalism which forbade the smallest effort to use their minds instead of
their knives and eyes, and established an abominable tradition that the
man who hesitates to be as cruel as Circumstantial Selection itself is a
traitor to science. For Weismann's experiment upon the mice was a mere
joke compared to the atrocities committed by other Darwinians in their
attempts to prove that mutilations could not be transmitted. No doubt
the worst of these experiments were not really experiments at all, but
cruelties committed by cruel men who were attracted to the laboratory by