Exception is taken to Roy's comments on conditions of formation of various manganese minerals, including braunite, bixbyite, hausmannite, and jacobsite, published in a discussion of a paper on the results of microscopic examination of manganese ores of Andhra Pradesh, India. (For references to the original paper and to the discussion, see this Bibliography Vol. 28, p. 302 and Vol. 29, p. 297, Krishna Rao 1, respectively.)

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