About The Author: Henry Gray, F.R.S., Fellow of the royal college of Surgeons: Lecturer on anatomy at St. George?s Hospital Medical School. Table Of Contents: Descriptive and Surgical Anatomy The Articulations Muscles and Fasclae The Blood-vascular system The Lymphatics The Nervous system The Organs of special sense The Organs of Digestion The Organs of voice and respiration The urinary organs The Male Organs of Generation The Female Organs of Generation The Surgical Anatomy of Hernia Surgical Anatomy of the Perinaeum General Anatomy or Histology Embryology

    As he did so masterfully in Prime Obsession, Derbyshire brings the evolution of mathematical thinking to dramatic life by focusing on the key historical players. Unknown Quantity begins in the time of Abraham and Isaac and moves from Abel's proof to the higher levels of abstraction developed by Galois through modern-day advances. Derbyshire explains how a simple turn of thought from this plus this equals this to this plus what equals this? gave birth to a whole new way of perceiving the world. With a historian's narrative authority and a beloved teacher's clarity and passion, Derbyshire leads readers on an intellectually satisfying and pleasantly challenging historical and mathematical journey.

    In the 1st edition, published in 1962, he spoke to that perennial reader he gently called "the troubled layman." His opening paragraph revealed his sympathy: "Why is this supposed to be art?" he quoted rhetorically. "How often have we heard this question asked--or asked it ourselves, perhaps--in front of one of the strange, disquieting works that we are likely to find nowadays in the museum or art exhibition?" Keeping that curious, questioning perspective in mind, he wrote a history of art from cave painting to Picasso that was singularly welcoming, illuminating & exciting. Sojourning thru this book, a reader is offered every amenity for a comfortable trip. Because he never assumes knowledge on the part of the reader, a recent immigrant from Mars could comprehend Western art from this text. The only assumption the Jansons have made is that with a little guidance everyone can come to understand the artifacts that centuries of architecture, sculpture, design & painting have deposited in our paths. Countless readers have proven the Jansons right & found their lives enriched in the process.