The method describes an inexpensive modification of the Beckman DU spectrophotometer which permits rapid recording of the spectral energy distribution reflected from a magnesium carbonate surface. Comparison with a standard tungsten source corrects the effects of selective reflectivity and phototube response to different wavelengths. The method should be useful to biologists interested in the effects of light on organisms.
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McAllan et al. (1962) studied this question.
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