A book of superstitions. Several of the pages have been bookmarked:
How to Prevent Magic Formation in the Earliest Stages
Should mage blood run through your line, no matter how distant the relation, avoid conceiving in winter. While with child, sleep with dried embrium beneath your pillow to ensure good health.
Infants and most small children will show no signs of magic. However, you can purge the body of unwanted elements before they take hold. Place leeches on each of the child's limbs. When done, burn the leeches. Be sure not to inhale the smoke. Afterwards, wrap the child's limbs in cloth blessed by a Chantry sister.
A child showing signs of magic may be submerged in water until the breath is nearly lost. If magic is still weak within them, it will die before the child. Should the trouble persist beyond reason, certain talismans may suppress the child's skill.