From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
To cause a Cow to give plenty of Milk.
When a cow bears the first calf, give her half of an eel's tail in half a loaf of bread, or however best it may be given, and the cow will certainly give a great deal, of milk.
The grimoire Egyptian Secrets of Albertus Magnus lists this spell.
Timeline of related events
1725Publication of Egyptian Secrets of Albertus Magnus (lists this spell)
1869English-language translation of Egyptian Secrets (lists this spell)