This is one of the most sophisticated medical astrology books ever written. Many of the finer points are dealt with. You know the head is ruled by Aries, but did you know the nasal bones are co-ruled by Scorpio? There are references to Vedic principles. A helpful diagram explains the subtle division of the urinary tract between Libra and Scorpio. Rulerships are given not only for areas of the body and its organs, but also for bones, muscles, arteries and veins. Terminology in the book is modern. Gemini's rulership of muscles includes the deltoid, biceps, supinator radii, subclavians, triceps,...