i68 



THE SOCIAL LIFE OF ANIMALS 



teaching is the most effective method yet discovered. 



Still another attempt was made to study group 



cohesion in these goldfish. For this purpose aquaria 



Fig. 37. An aquarium-maze arranged to test the 

 power of observation of fish placed in the side compart- 

 ment. (From Welty.) 



were arranged like those in Figure 37. At the side 

 of the usual aquarium-maze a narrow runway was 

 placed into which untrained goldfish were intro- 

 duced. In half of the tanks the glass partition was 

 clear and allowed the fish to see the reaction of those 



