PREFACE 



THE title of this book might more appropriately, if not more 

 concisely, have been "The Animal Mind as Deduced from 

 Experimental Evidence." For the facts set forth in the fol- 

 lowing pages are very largely the results of the experimental 

 method in comparative psychology. Thus many aspects 

 of the animal mind, to the investigation of which experiment 

 either has not yet been applied or is perhaps not adapted, are 

 left wholly unconsidered. This limitation of the scope of 

 the book is a consequence of its aim to supply what I have 

 felt to be a chief need of comparative psychology at the 

 present time. Although the science is still in its formative 

 stage, the mass of experimental material that has been accu- 

 mulating from the researches of physiologists and psycholo- 

 gists is already great, and is also for the most part inaccessible 

 to the ordinary student, being widely scattered and to a con- 

 siderable extent published in journals which the average 

 college library does not contain. While we have books on 

 animal instincts and on the interpretation of animal behavior, 

 we have no book which adequately presents the simple facts. 



Probably no bibliography seems to one who carefully 

 examines it entirely consistent in what it includes and what 

 it excludes. Certainly the one upon which this book is 

 based contains inconsistencies. The design has been to ex- 

 clude works bearing only upon general physiology, upon the 

 morphology of the nervous system and sense organs, or upon 

 the nature of animal instinct as such, and to include those 

 which bear upon the topics mentioned in the chapter headings. 



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