When a Cow is hard to become with Calf (Spell)

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

When a Cow is hard to become with Calf.

Take nine knots of an alder tree, in the spring of the year, powder them, and give to the cow upon a fresh baked piece of bread. It has been tried with success.

The grimoire Egyptian Secrets of Albertus Magnus lists this spell.

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