UNSOLVED PROBLEMS. 159 



as expressed in other chapters, that we have here to do with 

 a sort of morbid acquisitiveness of the character of that which 

 in man is known as kleptomania. 



And there are many other phenomena connected with 

 the habits of animals which at present puzzle us, which we 

 cannot satisfactorily explain, for which we cannot assign any 

 intelligible or obvious motive, cause, or object, and which 

 are really, or may be, morbid in their character, referable to 

 the category of disease, mental or bodily, to morbid impulse, 

 morbid feeling, morbid thought, morbid will, morbid fancy ; 

 while there are many other phenomena that may not be, 

 or appear to be, morbid, or the result of morbid mental 

 action, that are yet unexplained and that cannot be enume- 

 rated here. Sufficient illustrations as to number and variety 

 have already been given to indicate the kind of mental phe- 

 nomena, or phenomena connected with mental action, in the 

 lower animals that constitute puzzles or problems awaiting 

 solution, and which will probably repay careful experimental 

 enquiry. 



