"Milt" is a term for spleen, particularly the spleen of a farm animal.
From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
For the Spleen or Milt Disease.
Boil the following articles well together; one egg, one pint of wine, a little juniper salt, angelica, a little pepper, saffron, a little of the powder of alcion herbs, from one to three pinches of rasped hartshorn, and given to the cattle as warm as possible. Under the throat will appear a swelling, -which must be greased with good brandy and saffron, and a ring must be made around the swelling, of saffron and brandy. Also open the swelling and wash it out with brandy and saffron.
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)