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 hi regard to objects affords an opportunity for further 

 improvement; it leads not only to the acquisition of new 

 knowledge, but to training hi discrimination and practical 

 judgment. 



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