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There are books that are so disorganized and full of obvious untruths that one can immediately put them aside. There are others that are tantalizingly good but contain enough poorly expressed ideas and confusing paragraphs to give the reader a sense of insecurity over the parts he does not feel qualified to judge, with the result that the reader may discard the good along with the bad. There are books which are scholarly, with attention paid to the careful development of ideas and sufficient pertinent evidence for support of those ideas as to encourage the reader to consider the possible validity of even those ideas which seem foreign to his experience. The present book falls in the last category, probably by virtue of the fact that it is the culmination of a series of personal investigations by the authors into the subjects under discussion. Some of the pertinent bibliography can