CHAPTER IV.

Concerning the Philosophic Coition of the Husband with His Wife.
As soon as you see the woman take a black colour, know for a certainty that she has conceived and become pregnant : and when the seed of the man embraces the seed of the woman, this is the first sign and the key of this whole work and Art. Therefore preserve a continuous natural heat, and this blackness will appear and disappear through being consumed, as one worm eats another, and goes on consuming until not one is still left.