Cholera : how to prevent and resist it / by Max von Pettenkofer.

  • Max Joseph von Pettenkofer
Date:
1875
Catalogue details

Licence: Public Domain Mark

Credit: Cholera : how to prevent and resist it / by Max von Pettenkofer. Source: Wellcome Collection.

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    IO The next illusfcration i.s intended to sliow how readily air will pass through gravel soil. It represents a canary bird placed in a little chamber so arranged that no air can reaeh it unless it pass through the gravel wliich fills the upper and lower part of the glass cy linder. The bird receives abundance of air for respiration, all of which it must draw through the gravel. Ocular demonstration of the samefactcau be most strikingly afforded by the experiment illustrated in the next figure. It represents a tall glass tube filled with gravel, of a much greater
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