The Secrets of Albertus Magnus on the Nature of Women and the Virtues of Herbs

A botanical woodcut illustration of a catnip plant, featuring a central vertical stalk with opposite, heart-shaped leaves with serrated margins, terminating in dense flower clusters with fibrous roots.

...consumed by those who have a cold stomach; also, when placed in cloths upon the stomach, it warms it.

VI. Catnip.

Take this herb and mix it with the stone that is found in the nest of the bird called the hoopoe, and scratch the belly of an animal with it. It will then become pregnant or fertile.