This, it seems, is the method usually employed when the body is retained by one of its limbs in some narrow fork of a low-growing plant.

While trying to saw through the bone--a heavy job this time--one of the workers slips between the shackled limbs.

So situated, he feels against his back the furry touch of the Mouse.

Nothing more is needed to arouse his propensity to thrust with his back.

With a few heaves of the lever the thing is done; the Mouse rises a little, slides over the supporting peg and falls to the ground.
Is this manoeuvre really thought out?
Has the insect indeed perceived, by the light of a flash of reason, that in order to make the tit-bit fall it was necessary to unhook it by sliding it along the peg?
Has it really perceived the mechanism of suspension?
I know some persons--indeed, I know many--who, in the presence of this magnificent result, would be satisfied without further investigation.
More difficult to convince, I modify the experiment before drawing a conclusion.