SIRS,--While not seeking to prolong this correspondence unduly, for there is more than a grain of truth on either side, I feel that some reply is called for to Mr. Reginald Wagstaffe's letter (antea, pp. 319-320). May I point out at once that I do not dispute for one moment that colour changes in cabinet speciments do occur. That is obvious to anyone with experience in these matters. Also I would l...
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