Abstract
To establish the significance of a particular factor in the physiology of an organism, it is necessary to make it limiting, and to vary it at will. Today I have to discuss periodicities in plant growth. Until recently, all experiments on plant growth were carried out either with seedlings under apparently constant conditions of temperature and light for short periods, or with older plants under less controlled conditions. These usually involved natural light, or if artificial, the light was still supplied on a 24-hour cycle. But even under the best controlled conditions the plants were subjected to a 24-hour rhythm of air pollution, even in the countryside, where the air is oxidizing during day and reducing during night. The latter external cycle can be removed by passing all air through activated carbon filters. It is therefore not surprising that the 24-hour rhythm was not conceived as an important or essential
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