AQUATIC ORGANISMS AND EXTERNAL METABOLITES 513 



breathing has become adapted, and very speciaHzed auditory and 

 mental processes have evolved with it, as the principal means of 

 human communication. As a faculty it is often abused, and not 

 least in this present age, but there are those who have seen in 

 speech and its derivatives, the highest achievements of man. 

 Through it and its more recent evolution as the written word most 

 of human ecology today is organized — and sometimes disorganized. 

 As free metabolites, both carbon dioxide and oxygen, on land and 

 in the water, illustrate "group symbiosis on the great scale" and, 

 if for no other reason, this might have encouraged us earlier to 

 look for the more subtle examples, such as we are now finding. 



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