MENTAL LIFE OF APES AND MONKEYS 279 
screws; and when he was chained in a new place he investi- 
gated for hours the new fastenings of his chain. The 
development of this intellectual interest—if we may call it 
such—in regard to objects affords an opportunity for further 
improvement; it leads not only to the acquisition of new 
knowledge, but to training in discrimination and practical 
judgment. 
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