MENTAL CAPACITY 37 



does not require a great effort of the mind to appreciate 

 the possibility that these feeble faculties, in constant use 

 and under changed conditions, may develop into a higher 

 degree of strength and usefulness. In fact we find in 

 these creatures the embryo of every faculty of the human 

 being, including those of reason and speech, through the 

 exercise of which are developed the higher moral and social 

 traits of man. They appear to have at least the raw mate- 

 rial from which are made the highest attributes of the 

 human mind, and I shall not contest with them the right 

 of exclusive possession. 



