Excerpt from The Bio-Chemical Journal, 1909, Vol. 4
Experimental evidence of this persistence of relationship to light of all cells exists of two kinds; there is first the deleterious effects of complete withdrawal of light for prolonged periods, and the necessity of sunlight... . For healthy existence; and, secondly, there is the direct evidence of the effects of application of strong light to animal cells seen in the Finsen effects, and in other forms of radiant energy allied to light.
It is, however, in the more lowly organized types of both animal and vegetable organisms that the strongest and most direct reactions to light are observable - apart from the particular case of the reaction of chemical synthesis in the chlorophyll-containing cells of the green parts of the higher plants.
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