PREFACE 



THE FIFTH EDITION. 



Aftbe the death of Dr. Hurst in the spring of this year, I 

 was asked to undertake the revision of the present edition of 

 this book. My connection with Professor Milnes Marshall 

 and Dr. Hurst enabled me the more readily to comply with 

 this request. No new matter involving a change in the plan 

 of the work has been added. I have, however, thought it well 

 to recast the chapters on technique, and to adopt many of the 

 alterations and additions which have been suggested by a con- 

 stant use of the last (1895) edition. My friend and colleague, 

 Mr. J. H. Ash worth, has aided me very signally throughout, 

 and I must also express my indebtedness to Professor Hickson, 

 and to Mr. F. J. Cole, Demonstrator in the Zoological Depart- 

 ment of University College, Liverpool, for his assistance in cor- 

 recting the account of the nerves and lateral sense-organs of 

 the Dog-fish. The digits of the bird's wing — a subject on which 

 Dr. Hurst held the heterodox view of their homology with 

 the third, fourth, and fifth digits of the reptilian hand — I 

 have named topographically, a via media which has the recom- 

 mendation of not implying a conclusion based on evidence 

 which cannot be presented in this work. 



P. W. GAMBLE. 



Owens College : December 1898. 



