ABSTRACT
Numerous facts witness in a vague way to the ability of fishes to profit by experience and fit their behavior to situations unprovided for by their innate nervous equipment. The fish dislikes the sunlight and tries to get back to D. The fish has clearly profited by his experience and modified his conduct to suit a situation for which his innate nervous equipment did not definitely provide. He has, in common language, learned to get out. 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. 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.
