SIRS,--Messrs. Wagstaffe and Williamson's paper (antea, Vol. xl, p p . 322-325), on t h e cabinet colour changes in bird skins, will be read b y all workers in systematic ornithology with great interest. That these changes occur is of course well known, and t h e value of t h e communication lies principally in indicating in what species these effects occur and to what extent, while it is equally i...

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