68 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



analytic expression, but the explanation of the great absorption by an 

 extended audience surface is not difficult to understand. In addition 



Figure 3. 



to the above there is another partial explanation which contributes to 

 the results. The felt forms a perfectly continuous medium, and there- 

 fore otfers a comparatively rigid reflecting surface. The comparatively 

 light, thin, and porous nature of the clothing of women, perhaps more 

 than of men, contributes to the great absorption of the high notes. 



