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Show Ultra-Violet Light Not Good for Planls Extra doses of ultra-violet light are not so good for plants as for animals, It appears from experiments carried on In London by E. M. Delf, K. Rltson and A. YV'estbrook, working at Kew gardens and Bedford college, England. The experiments were undertaken with the Idea of finding the possible effect of the light on plants brought from the South to northern countries where there is much less sunshine. To seedlings and older plants treatments treat-ments were given with quartz mercury mer-cury vapor lamps, similar to those given human beings. Germination and growth were retarded and In older plants leaf formation was partly Inhibited In-hibited and flower formation and budding bud-ding were held back. |