The reviews of the first edition were glowing, and rightly so because this is a superb book. Tov is a world authority in his subject, and has the ability to explain his complex technical subject with great lucidity. This second edition is, however, almost a page for page reprint of the first edition and has only a few small revisions. This is disappointing, and we look forward to a more thoroughly revised third edition in the next few years. Anyone with a first edition need not bother with this one. However, everyone else with more than a beginner's interest in the subject should buy this book now.