The first reviewer of this book is perfectly correct in giving this book a five star-rating and calling it a must read. But she doesnt go far enough! This book, and its sequel, Volume Two, are masterpieces of good history and good writing. I review both books under Volume Two but feel compelled to repeat my analysis here as well, and I am not even an astrologer, nor actually believe in it with any certainty. Having completed Volume One, and now, finally, Volume Two after an entire summer of reading, I stand in awe at this man's ability to wade through an ocean of conflicting and confusing history, involving philosophy, religion and social upheavals, and somehow never lose cite of his central thesis--the ebb and flow of astrological beliefs. And all in very readable prose, carefully documented, and largely unbiased. Of course, with such a broad overview, and with so many influences and trends to dissect and analyze, there is no doubt that experts in individual fields may quibble about certain points and generalizations. After all, this is controversial material concerning a movement embraced by some, but reviled by many powerful forces. But that doesn't detract from the value of this encyclopedic work. Whether you believe in Astrology or not, noone can deny that it has played a major role in the intellectual and psychological life of Man since the beginning of time, and a respectful interest in its development is certainly warranted by anyone, whether academic or not. And noone does this with such clarity and insightful prose through the jungle of intellectual ideas than Campion, in two massive volumes of scholarship. I should know...I am a college writing teacher, and can professionally declare that this is great writing, not just great scholarship. I only regret that having read the complete work through once, I will probably have to do it several times over again, before I retain even a tiny portion of the information presented in these dense but fascinating texts.