xii COMPARATIVE ANATOMY 



I have taken my own course as regards the arrangement and 

 method of treating the material. I must naturally leave it to my 

 fellow-zoologists to decide how far I have succeeded. 



I have given special care to the illustration of the book. It 

 contains a large number of illustrations now for the first time accessible 

 to the majority of students ; these I have, for the most part, myself 

 adapted to the requirements of the text. I have to thank the 

 practised hand of my pupil, the young scientiiic artist, Mr. Sokolofsky 

 of Hamburg, for some particularly good illustrations. 



I owe my best thanks to my honoured publisher, Mr. Gustav 

 Fischer, for his obliging courtesy. 



Jena, 1888. 



