PREFACE TO THE FIFTH EDITION 



The present revision of this Manual has been made by the 

 undersigned for the purpose of modifying and enlarging the 

 fourth edition. Some important changes in classification have 

 been made and the instructions for the study of certain 

 commonly used animals have been made more complete. 

 Such errors as had not been eliminated in earlier editions 

 have, it is hoped, been corrected. The glossary has been 

 thoroughly rewritten and enlarged. 



J. A. Dawson, 

 L. P. Sayles. 



New York City, N. Y. 

 March, 1936 



