Loud knocks were heard at the door.
When the waste contains any large percentage of worm or chrysalis, it is taken to a " cocoon beater," a machine which has a large revolving disk on which the silk is put, and while revolving slowly is beaten by a leather whip or flail, which loosens the silk and knocks out the wormy matter.
In 1500, the pope on the Christmas Eve with which the jubilee begins goes in solemn procession to a particular walled-up door ("Porta aurea") of St Peter's and knocks three times, using at the same time the words of Ps.
From an evidential point of view the apparition is the most valuable class of death-warning, inasmuch as recognition is more difficult in the case of an auditory hallucination, even where it takes the form of spoken words; moreover, auditory hallucinations coinciding with deaths may be mere knocks, ringing of bells, &c.; tactile hallucinations are still more difficult of recognition; and the hallucinations of smell which are sometimes found as death-warnings rarely have anything to associate them specially with the dead person.
A child knocks itself and runs at once to the arms of its mother or nurse to have the aching spot rubbed or kissed, and it feels better when this is done.