Introduction to the Book To My brother, Dr. Assad Haddad My Egyptian Pauline physician and my Prosperian surgical physician in Alexandria ---My beloved brother, Given the care you took in nurturing me with the milk of knowledge, and the effort you expended in assisting our revered parents in educating my mind, and your esteemed scientific position, I present to you the first fruits of my labor and the opening of my first writings in your name. So, accept this, my dear brother, as an acknowledgment of your favor and a remembrance from your brother, Gabriel