NATURALIST'S CAEINET. 



Experiments by Dr. Munro. 



each bottle, and prevented the water from 

 getting into the bottle by wrapping a piece 

 of wet bladder round the neck of it and the 

 neck of the tube which entered into it, and 

 tying the tube and neck of the bottle to each 

 other. After filling the tube with gun-powder, 

 he fixed to the top of it a piece of match 

 paper; and into the match paper, just over 

 the top of the tube, he put two ounces of gun- 

 powder. He then sunk the bottle near the side 

 of a lake to the depth of about two feet, and 

 went into the water at the greatest distance pos- 

 sible, which was about eight hundred feet, and 

 laid himself on his back in the water, with his 

 eais under its surface, and nose and eyes above 

 it. The match was then set fire to by another 

 person; and as it was midnight, he saw the flash 

 of the gunpowder contained within the match, 

 and soon after heard the noise of the explosion 

 of the gunpowder within the bottle. But he 

 found it impossible in this way to determine the 

 velocity of the sound with accuracy, as the gun- 

 powder in the bottle was not set fire to through 

 the tube sufficiently instantaneously as to have 

 the desired effect. The piece of water not being 

 extensive enough, and being unprovided with a. 

 proper apparatus, the only conclusion to be then 

 drawn was, that after the bottle burst, he heard 

 'one, but did not hear Uvo explosions: so tli:it 

 the water seemed to convey the sound nearly iu 

 'the sciu:e manner as the atmosphere. 



