By Herbert M. Richards

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Extra info for Acidity and gas interchange in cacti

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The general conclusions which seem justified from these data are that the higher the initial acidity the higher also is the rate of respiration, and the lower it is the lower also will the rate be. Plants of high acidity kept in the dark at normal temperatures, while they do not show a very great decrease in acidOn the other hand, content, do not ordinarily show an increase thereof. in the dark at not above of low 35 C. universally temperatures plants acidity show a gain in acid-content up to a certain point.

While, of course, the carbon dioxide formed during respiration diffuses out from the tissues into the surrounding air, it would seem probable that, at night at least, the gases held in the tissues must be very poor in oxygen, and consequently the conditions approach those where intramolecular respiration comes into play. The point is one of considerable inter- and demands further investigation, particularly in regard to the nature of the inclosed gases and the role of intramolecular respiration in these plants.

It is realsome of the intensity of the sunlight is lost in transmission through the glass and the water and that the results do not give the entire possible For this latter purpose it would be necessary effect of exposure to the sun. to utilize quartz or special glass for the receiver and cool it by some device which did not require the immersion in water. With such an apparatus one might indeed obtain an even greater evolution of carbon dioxide. The figures ice ized that are under rather than over the possible ones.

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Acidity and gas interchange in cacti by Herbert M. Richards

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