vi GENERAL ZOOLOGY 



Although in the current revision there have been numer- 

 ous changes in and additions to the illustrations, the draw- 

 ings which have given such distinction to the original edition 

 have been for the most part retained. These were the work 

 of Mr. S. F. Denton, Mr. L. H. Joutel, and Mr. E. N. 

 Fischer. In numerous instances the key letters or numerals 

 standing at the ends of leader-lines have been replaced by 

 full names, thus obviating the necessity of referring to a 

 legend to secure the names. For the many courtesies which 

 have made possible the use of drawings and photographs, 

 acknowledgment is offered with the individual figures. 



The extensive list of zoologists and specialists who aided 

 in the course of the preparation of the original edition will 

 be found in the detailed acknowledgment in the Preface of 

 that edition. 



It is our hope that the quotations which introduce the 

 chapters will serve to suggest to the imagination of young 

 students the poetic side of animal life and of nature gener- 

 ally. For some of the most fitting quotations we are in- 

 debted to personal friends. 



H. R. L. 



H. A. K. 



H. J. Van C. 



