182 OTTO C. GLASER 



be solved in the dark, and the solution, may with repetition, 

 become a habit, but the evidence does not show that the sense 

 of sight plays no part under other circumstances. Watson's 

 negative evidence on this point seems very good, but the maze 

 problem and the tank problem differ so much, that what is true 

 in the solution of the one, is not of necessity true in the solution 

 of the other. 



TOUCH 



Touch in the ordinary sense, is practically eliminated by the 

 nature of the problem. The actual solution takes place in a 

 medium in which the animals float. There are no solid bodies to 

 be touched; no differences in homogenity in any direction, that 

 might guide the individuals to the correct opening. The same 

 thing applies to the temperature sense. It is possible, however, 

 that touch and temperature, singly or together, affect the result, 

 but if they do, it is not in the usual way, but as the initiating 

 stimuli of other activities. 



THE KINESTHETIC CHAIN 



With hearing, smell, sight and touch, either eliminated, or 

 shown to be not essential, the question of how the habit becomes 

 established, naturally arises, Watson ('07) and others have 

 presented a large body of evidence suggesting that the kines- 

 thetic sense may be the controlling factor in the behavior of the 

 white rat. My own experiments seem to bear similar interpre- 

 tation, but if the facts corroborated by the tank method are due 

 to a kinesthetic sense, it follows that this needs investigation. 



Granted that a relation exists between the objective phenomena 

 which we call a habit, and the inferred basal kinesthesia, the 

 inference that the relation is definite, seems just; for the habit 

 itself is definite, and capable not only of exact measurement, but 

 also of modification. It follows that in the emergence of a habit, 

 the internal basis also is modified, for the habit itself is modified 

 behavior. In other words, kinesthesia is easier to understand if 



