ACKNOWLEDGMENTS 



The author is grateful to the following publishers for permission to 

 use copyrighted material. To find exact information- on the source of 

 any specific quotation, please refer to the detailed bibliography at 

 the end of this book. 



George Allen & Unwin, Ltd. 



American Scientist 



American Sociological Review 



Basic Books, Inc. 



G. Bell & Sons, Ltd. 



British Journal for the Philos- 

 ophy of Science 



Butterworth & Co., Ltd. 



Cambridge University Press 



Columbia University Press 



Constable and Co., Ltd. 



J. M. Dent & Sons, Ltd. 



Daedalus 



Diogenes 



Doubleday & Company, Inc. 



Etc., A Review of General Se- 

 mantics 



Farrar, Straus & Company, Inc. 



Free Press of Glencoe 



Harper & Row, Publishers, In- 

 corporated 



Harvard University Press 



William Heinemann, Ltd. 



Holt, Rinehart and Winston, Inc. 



Horizon Press, Inc. 



Hutchinson Publishing Group 



Library of Living Philosophers 

 Longmans, Green & Co., Limited 

 Lund, Humphries & Co., Ltd. 

 Macmillan & Co., Ltd. (London) 

 Macmillan Company (New York) 

 McGraw-Hill Book Company, 



Inc. 

 David McKay Company, Inc. 

 W. W. Norton & Company, Inc. 

 Open Court Publishing Com- 

 pany 

 Oxford University Press 

 Pergamon Press 

 Philosophical Library 

 Philosophical Quarterly 

 Sir Isaac Pitman & Sons, Ltd. 

 Princeton University Press 

 Routledge & Kegan Paul, Ltd. 

 W. B. Saunders Company 

 Scientific Monthly 

 Simon & Schuster, Inc. 

 \Jniversity of California Press 

 University of Chicago Press 

 University of Pennsylvania Press 

 John Wiley & Sons, Inc. 

 Yale University Press 



