A bishop with right hand raised in blessing, performing the wedding of a King on the left and Queen on the right, under a dark cloud from which heavy rain is falling. Above the cloud a rainbow forms its bow, at the left of which is the Sun and on the right the Moon. On the left in front of the King a cylindrical vessel is being heated on a fire. On top of this vessel is a double-faced head, the mouths of which hold collecting flasks. Flames burn on the top of the head. Behind this in the distance is a swan or goose. On the right in front of the Queen, an alchemist with a trident tends a furnace, pouring water from a flask into a water bath in which an alembic or retort is being heated. The fumes which are emitted condense and are collected in a flask below, which already has a layer of liquid in it.