Ethical Considerations 
and in the ecological concept, neither of which were in existence 
a hundred years ago (except in a very rudimentary form) but 
which are now turning out to be very important ways of 
organizing our thinking about life and its environment. Indeed 
there are many important new concepts which we could bring 
out in a radically reorganized educational system. 
Brain: We might end our symposium with another remark 
of Blake’s: “Without contraries is no progression.’ All that 
remains is to thank you all for coming, and to repeat what 
Bronowski so aptly said, ‘‘We met as colleagues and we part 
as friends.” 
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