The general theory of magnetism and the vast range of individual phe- nomena it embraces have already been examined in many volumes. Spe- cialists hardly need help in charting their way through the maze of pub- lished information. At the same time, a nonspecialist might easily be discouraged by this abundance. Most texts are restricted in their coverage, and their concepts may well appear to be disorganized when the uninitiated attempt to consider them in their totality. Since the subject is already thoroughly researched with very little new information added year by year, this is hardly a...