EFFECT OF HYDROGEN ON THE VOICE.
Make a hole through a wine cork of sufficient size to admit a smaller cork; through which make another hole, and fix it into the larger one. Tie the corks thus fixed into the neck of a bullock’s bladder, previously exhausted of air; let a tube from a bottle generating hydrogen pass very tightly through the aperture in the small cork, and the gas will distend and fill the bladder. The instant it is full, withdraw the inner cork, and either prevent the escape of the gas by means of the thumb, or cork it closely, till the operator is ready to breathe the gas; to do which, he should put the open cork into his mouth, and take one inspiration, when, on immediately speaking, his voice will be remarkably shrill. The effect will pass off in a few seconds.