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The Pamphlet Collection of Sir Robert Stout: Volume 29

Influence of Light upon Vegetation

Influence of Light upon Vegetation.

—In observing the influence upon vegetation of the long duration of light during the summer months in high latitudes, Dr. Muller found that at 70 deg. N. lat. peas grew at the rate of three and a half inches in 24 hours for many days during the season, and that certain cereals grew at the rate of two and a-half inches in the same specified time. He also noted that the constant presence of light increased t hose secretions in plants which are due to the influence of actinic force on the leaves. The colouring matter and pigment-cells were in much greater amount, and the tints of the coloured parts were consequently deeper. The same effect was produced upon the secretions which give flavour and odour; so that the fruits of Northern Norway, though less sweet, are more savoury than those grown in the South.