In Grand Grimoire:
Take the heart of a pigeon and the head of a frog. Dry them as above, and reduce them to fine powder. Put the powder into a little purse, and add moss for frangrance.
Put the purse under the woman’s ear while she is sleeping, fifteen minutes later, she will unveil all of her secrets. Make certain to remove the purse a few minutes after she has stopped speaking otherwise she could fall into delirium.
"Dry them as above" here refers to the process described in To be Lucky in every Enterprise
The grimoire The Grand Grimoire lists this spell.
Timeline of related events
1821Publication of the Grand Grimoire (lists this spell)