CONTENTS. 



Page 

 Dedioatioit , iii 



Fbevaoh r 



OHAPTES I. 

 Inteoduction 1 



OHAPTBE 11. 

 The Extbbnaii Stbfotuee of Bieds 134 



OHAPTEE in. 

 The Istbbnal SsELETOJif 167 



OHAPTEE IV. 



The othbe Systems of OEaAws, ahb the Dbtelop- 



MElfT AND MldEATION OF BiBDS 202 



OHAPTEE V. 



The Q-BOLoaioAL and Gf^EOffSAPHioAL Eblations op 



BiBDS 235 



OHAPTEE VI. 

 The CiiASSifioation of Bieds 251 



Alphabetical Index 307 



