COMMUNICA riON 99 



wonderful. It is estimated that a single word or revolver-shot 

 will be repeated hundreds, and in some places, thousands of 

 times, producing a perfect bedlam of sounds. 



The voice over the telephone and the reproduction of the 

 voice on the phonograph are in one sense an echo. When the 

 phonographic record is made, the sound wave causes a needle to 

 vibrate and traverse the surface of the blank record plate, leav- 

 ing very slight indentations. When the record is placed in the 

 machine, and the needle is allowed to traverse these indentations 

 at the same speed, the sounds are thrown off through the needle 

 and made audible to the human ear by the magnifying qualities of 

 the machine and its horn. 



I believe it is possible to trace the echo in other ways than 

 through sound. I believe good thoughts, kind deeds, and a loving 

 heart produce echoes that are still more interesting than those 

 produced by sound. Let us study them all. 



COMMUNICATION 



[Editor's Note: When the article on "Instinct or Intelligence?" was 

 printed (in the March issue of the Review), it was anticipated — and hoped. 

 — that it would call out a reply. In no field of scientific study is caution, 

 more necessary. The editor is very glad to print the following com- 

 ment.] 



Editor Review : 



I notice the question raised in the last number of the Nature- 

 Study Review as to whether the goose refusing to give the call 

 after three of four flocks had been fired into, might be credited 

 to intelligence. I think it is much more rational to assume that 

 the goose had been so much frightened by the first four experi- 

 ences that the coming of the fifth flock aroused the instinct of 

 fright rather than of greeting. 



Very truly yours, 



E. Davenport. 



