The book Physiology And National Needs was written by author Arthur Dendy Here you can read free online of Physiology And National Needs book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Physiology And National Needs a good or bad book?
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It was quite evident that a weevily sample of barley had been sealed up and that weevils had been able to maintain themselves for four years in some of the tins in which the soldering had been imperfect. It must be remembered that an imperfectly closed vessel, such as a tin can, itself ^' respires, " to use a much-abused word in another of its many senses, to some extent like a human being. Changes of temperature and pressure pump air in and out of any small opening, so that the oxygen supply i...n the interior is constantly being renewed. The same process is responsible for the appalling accumu- lation of dust that takes place in closed drawers in London. The incoming air is laden with dust particles which are deposited before the air is replaced by a fresh dust-laden supply. 128 PHYSIOLOGY AND NATIONAL NEEDS Thus it is evident that a very minute aperture in a tin or other receptacle may be quite sufficient to maintain a number of insects in a healthy con- dition in the interior, and to give rise to the belief in their independence of ventilation.
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