350 On the Compressibility of Water. 
cement, had been torn up on one side before the bottle burst. 
The effect produced upon the cork can, we imagine, be ac- 
counted for only in one way, viz. that the water, divided 
into very minute particles, must, by the surrounding pressure 
of water, have been forced through the coverings, and filled 
the bottle; that the water thus forced in, and condensed to 
a great degree, expanded as the pressure was removed by 
drawing it towards the surface, not only so as to press the 
_ cork back into the neck, and, owing to the resistance of the 
coverings, to compress it half its size, but to nebarete the 
neck from the body of the bottle. 
Experiment 4. An empty porter bottle, the strongest 
that could be found, was stopped in the following manner. 
A cork, with a large head, was firmly driven into the neck ; 
it was then covered with six layers of fine linen, saturated 
with a composition of tar and wax ; over them was applied 
a covering of leather, and all perfectly secured by being 
well bound at the neck. The bottle, thus prepared, was 
unk two erates Soe fathoms. ling drawn in, 
coverings were So off, gee fer ecg Sora no signs . 
moisture were visible. Had the bottle remained down 
sufficient length of time to have completely filled, it Bi 
undoubtedly have been broken by the expansion of the 
water upon being drawn towards the surface, as was the 
case in the former experiment. It is worthy of remark, 
that, when the water from this bottle was Pci, into a 
tumbler, it ef effervesced like mineral water. 
»xperime nt 5. In this experiment, cee strong bottles 
were sunk to the depth of five hundred fathoms. One of 
them was stopped with a ground glass stopper, and well 
cemented, then placed in a strong canvass bag. n the 
bag was drawn j in, it was found that the bottle had been 
crushed into many thousand pieces. The other bottle was 
very tightly corked, but, not having been left down a sufli- 
cient length of time, it came up whole, having filled to within | 
Sere half inch. hair had been s idlce inane, re- 
(¢) Thi eee: -vescence ee te arom he wp of hihi 
