INTRODUCTION xi 
times, I continue to doubt ; in all those that I have seen the 
trainer displays some kind of whip, and the animals seem to 
have a very full appreciation that it is more than a symbol of 
authority. 
Although I can take no credit, and have no responsibility 
for the form in which this edition is presented to English 
readers, I have had some opportunity of comparing it with the 
German text, and believe it to be a very accurate rendering 
of the substance of a remarkable book. 
P. CHALMERS MITCHELL. 
