Selective Action of Polarised Light upon Starch Grains

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IT was with much interest that I read the letter relating to the action of polarised light on starch hydrolysis contributed to NATURE of December 5 by Prof. Baly and Dr. Semmens. This letter, since the writers refer to a short “note” by myself in the Annals of Botany (July 1925), calls for a brief reply.

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