Hexensalbe (Witches Salve)

 "The proportion of those transcripts from witch trials that give detailed descriptions of flying ointments is not great, although there are numerous examples of witches applying a flying ointment before departing for the Sabbath. In such cases the ointment, or at least the appropriate recipe, was usually provided by the devil himself. It is the continuous presence of this ointment which gave some credence to the concept of flight which was hotly contested as early as the tenth century CE; and no doubt it is still under examination today only because the possibility of a hallucinogenic ointment somewhat tempers rational disbelief in the subject. 

Reginald Scot's 'The Discoverie Of Witchcraft' of 1584 is the most forthcoming text in terms of recipes, much of which Margaret Murray lists in her Witch-Cult In Western Europe as 'hearsay evidence' - in other words, she does not follow up on, or even provide, Scot's sources. Scat in fact quotes from one man, 'cousened by an old witch' known as Johannes Baptista Neapolitanus from whom he learnt that witches

 [take]... the fat of yoong children, and seeth it with water in a brasen vessell, reserving the thickest of that which remaineth boiled in the bottome, which they laie up and keep, untill occasion serveth to use it. They put hereunto eleoselinum, aconitum, frondes populeas, and soote."

Caveat Anoynter! : A Study of Flying Ointments and their Plants By Sarah Penicka