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, serratus anticus minor, pectoralis, palmaris, etc. Many chapters are unique, such as Chapter 5, on crystallization, and Chapter 6, on tonicity, atonicity, and perversion. This chapter also tells how pairs of planets mirror each other: Sun/Moon, Mars/Saturn, Jupiter/Venus, Uranus/Neptune, with Mercury as a receiver. Chapter 11 concerns many different kinds of planetary strengths, among them, aspect strength, mundane strength, natural strength (the planet in its natal sign) and directional strength. Chapter 13 gives astrological indicators for some specific diseases, a foretaste of what Charles Carter would expand upon in his famous Encyclopaedia of Psychological Astrology. This book was originally published as Alan Leo's Astrological Manual No. 9 in 1908. This is the second edition of 1914. There are references in this book to other books in the Alan Leo series, dealing with chart construction. This book is highly recommended by H.L. Cornell in his Encyclopaedia of Medical Astrology. Heinrich Daath's Medical Astrology is part of a comprehensive series of classic astro-medical texts published by Astrology Classics. Other books in the series include: - Joseph Blagrave: Astrological Practice of Physick, 1671 C.E.O. Carter: An Encyclopaedia of Psychological Astrology, 1954 H.L. Cornell: Encyclopaedia of Medical Astrology, 1933 Nicholas Culpeper: Astrological Judgement of Diseases from the Decumbiture of the Sick, 1655, and, Urinalia, 1658 Richard Saunders: The Astrological Judgement and Practice of Physick, 1677 Luke Broughton: The Elements of Astrology, 1898"