3l8 ' PHYSICS: A. G. WEBSTER Proc. N. A. S. 
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horns are also shown on the figures. The experiments were made by my 
then assistant, Dr. H. F. Stimson, to whom I am indebted for his careful 
work. 
It will be seen that the theory is very substantially verified, the de- 
fect in it being due to the very rough estimate made about the correction 
of the open end which, as I stated in my paper on horns, is far from being 
accurate. But inasmuch as it is the only theory that has ever been given 
I feel that the results constitute a distinct advance. Prof. G. E. Stewart 
has done a large amount of work on horns and he also confirms my theory 
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