88 Mr White, The Origin of the ‘ Wolf-note, etc. : 
a bowed stringed instrument consists in forcing a system to vibrate 
with certain frequencies, and the ‘wolf-note’ arises when the im- 
pressed pitch approaches the ‘natural pitch’ of the system. The 
fluctuations in intensity are due to beats which accompany the 
forced vibration impressed on the resonator and which by reacting | 
on the string may interfere with even bowing. 
These preliminary experiments were carried out in the| 
University of Bristol at the suggestion of Dr A. M. Tyndall to 
whom I wish to express my best thanks. A complete study of the | 
problem is now being made which will deal with the nature of the: 
resonator, the mechanism producing the imperfect quality and 
methods adopted to minimise the effect of the ‘ wolf-note.’ i 
results of this work will be published shortly in a joint paper with 
| 
Dr Tyndall. 
My thanks are also due to Dr H. Brown, F-.R.S., for his interest. 
in the problem and his kindness in placing an instrument at my 
disposal for the experiments. 
