viii COMPARATIVE ANATOMY 



authors in the text. From the very first this question caused me 

 much perplexity, and I made repeated attempts to indite single 

 chapters so as to bring in the historical development of the branch 

 dealt with, together with the names of the most important authors. 

 I then found that if this course were pursued the book would 

 attain twice its present dimensions, that is, if strict impartiality 

 were to be invariably observed. This latter I was resolved on no 

 account to renounce, and I therefore determined to exclude from 

 the text the names of all authors without distinction. Any one Avho 

 is interested in knowing how a special question stands, can easily 

 find his bearings by careful comparison of the text with the illustra- 

 tions (the origin of which is everywhere given), and by consulting 

 the literature. I have convinced myself of this among my own 

 students. 



I must here express my thanks to my honoured and dear friend, 

 Mr. Gustav Fischer, for the care and patience he has exercised in 



connection with this work. 



ARNOLD LANG. 



Zurich, July 1S94. 



