THE LANGUAGE OF ECHOES 



echoes are a special language of their own. It is much 

 simpler than German, Chinese, or English, but men, 

 particularly blind men, find it very difficult to learn this 

 language. Yet bats no larger than a baby mouse under- 

 stand it well enough to catch ten mosquitoes every min- 

 ute in the dark. What is it in a bat's tiny brain that per- 

 mits understanding of this language and unlocks this 

 library of useful information? No one yet knows the 

 answer. We cannot even be sure we are asking the 

 proper questions. 



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