When a Cow's Usefulness is taken to find out the Person and mark the same who caused the Trouble (Spell)

From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:

When a Cow's Usefulness is taken, to find out the Person, and mark the same, who caused the Trouble.

On the day of the patron Demetrius, enter a grocery store, buy a steel, purchase and pay for the same without bartering, and have it forged on this very day. The steel must be square, about a span in length, as thick as a foot measure, and, what­ever the blacksmith may ask, you must pay. Early in the morning take milk from the cow in the name of God before the witch milks. After this make a fire upon the hearth, put the steel into the fire till it grows red, then take a pair of wooden tongs and draw the steel from the fire, and put the steel into the dish wherein the milk is and keep it there so long till the milk is all evaporated. If the milk is entirely dried out, the witch who caused the mischief must die; but in case the milk is not entirely dried out, the witch will contract blisters upon hands and face, so that she will not be able, for a long period to expose herself before the people.

The grimoire Egyptian Secrets of Albertus Magnus lists this spell.

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