This volume is dedicated 



to the memory of 



two great zoo geographers, 



CHARLES DARWIN and 

 ALFRED RUSSEL WALLACE 



Whose observations and reflections on the distribu- 

 tion of animals provided much of the evidence that 

 led them, just one hundred years ago, to propose to 

 the world the epochal concept of Organic Evolution, 

 which unshackled the minds of men and helped in- 

 augurate the Age of Science. 



