PREFACE TO THE SEVENTH EDITION 



THIS book is intended to serve as a Manual which 

 students of Zoology may use in the lecture room, museum, 

 and laboratory, and as an accompaniment to several well- 

 known works, cited in the Appendix, most of which follow 

 other modes of treatment. 



To numerous authorities I acknowledge an obvious 

 indebtedness, a detailed recognition of which would be 

 out of place in a book of this kind. I must, however, 

 acknowledge that in the preparation of a previous edition 

 I had throughout the able assistance of Miss Marion 

 Newbigin, D.Sc., and I have also been aided by sugges- 

 tions from various kindly critics, especially Professor 

 W. C. M'Intosh, Professor P. J. White, the late Dr. 

 Ramsay Traquair, Dr. John Beard, the late Mr. J. G. 

 Goodchild, Dr. Arthur Masterman, Dr. John Rennie, 

 Dr. W. D. Henderson, Mr. E. S. Russell, Mr. W. P. 

 Pycraft, Mr. C. Tate Regan, and Professor H. J. Fleure. 

 For most of the figures I am indebted to my artist 

 friends, Mr. William Smith, Miss Florence Newbigin, 



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