vi PREFACE 



accepting witliout question whatever he may come across in print, 

 for even textbooks are often known to l)o incomplete and liable to 

 error. 



Again, if the art of reading between the hnes has not been culti- 

 vated, it does not greatly avail simply to scan the printed hnes 

 themselves. Every opening that induces the reader to seek further 

 should be gratefully prized. 



Goethe once said: "Wer nicht mit der Bewunderung anfangt, 

 werdet nie in das innere Heiligthum eindringen." Wonder is truly 

 the mother of wisdom, for once the capacity for wonder slips away, 

 one is prone to become blase, imcomfortably sophisticated, and 

 intellectually slothful. 



With this explanation of the way it is hoped that this book will 

 be used, the authors unite in cordially inviting the reader to join 

 them in exploring the following pages. 



