No. 396.] THE PSYCHOLOGY OF FISHES. 925 
the one described— a process which I have discussed at length 
elsewhere.! 
Whatever interest there is in the demonstration in the case of 
the bony fishes of the same process which accounts for so much 
of the behavior of the higher vertebrates: may be left to the 
neurologists. The value of the experiment, if any, to most 
students will perhaps be the extreme simplicity of the method, 
the ease of administering it, and its possibilities. By using 
long aquaria one can study the formation of very complex series 
of acts and see to what extent any fish can carry the formation 
of such series. By proper arrangements the delicacy of dis- 
crimination of the fish in any respect may be tested. The 
artificiality of the surroundings may of course be avoided when 
desirable. 
1 Animal Intelligence; An Experimental Study of the Associative Processes 
in Animals. Monograph Supplement No. 8 to the Psychological Review, June, 
1898. 
