but day after day no mouse entered.  The poor little thing gave unequivocal signs of extreme hunger by gnawing the bladder from one of my chemical bottles.  I gradually removed everything from the room that he could possibly eat, but still the old proverb of “Once caught, twice shy,” so far applied that he would not enter my trap.  After many days, visiting the apartment one morning, the trap was down, the mouse was caught; the pangs of hunger were more intolerable than the terrors of imprisonment.  He did not, however, will the unpleasant alternative of entering the trap until he was so nearly starved that his bones almost protruded through his skin; and he freely took bits of food from my fingers through the wires of the cage.”—­Instinct and Reason, just published.