From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
For Irritable and Bristly Horses.
Take a handful of gunpowder, pound it fine, add the albumen of an egg, and unwatered butter of the size of a hen's egg. Mix well, and grease the raw parts therewith. It would be well to wash them first with a good lye.
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)