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(preface 



TO THE FIFTH EDITION 



EIGHTEEN THOUSAND COPIES of this book have been 

 sold. For the present edition, numbering ten thousand, 

 several of the articles have been re-written, some addi- 

 tions made, and the whole text has been carefully revised. 



We gladly avail ourselves of this renewed opportunity 

 of tendering grateful acknowledgments to numerous corre- 

 spondents for kind suggestions 



355 



