Egyptian Secrets contains two versions of this remedy with minor differences.
From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
For the breaking out of Felons.
Take Venetian glass, pulverize it, Spanish pepper, honey and winter galls; mix together, spread it upon a stone-bear-cloth and apply to the horse's sores; let it remain for three days and the worm will ooze out.
From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
For the Breaking of Felons.
Take Venetian glass, half an ounce of pepper, honey, beef gall. Mix all these articles and pound them. Spread them upon a hairy cloth, and tie around the felon of the horse. Let it remain from three to four days.
The grimoire Egyptian Secrets of Albertus Magnus lists this spell.