. Bulletin of the British Ornithologists' Club. Vol. 73 38 ]953 Let us now examine other species groups as to whether any other instances of a similar nature can be discovered. To the Xth International Ornithological Congress at Uppsala in 19506 I submitted certain evidence of this phenomenon, which may perhaps best be described as reverse mutation, in the genera Garrulus, Pica and Dendrocopos, in support of the hypothesis that such variations in pattern, are to be explained on genetic grounds and have great biological significance. 'Reverse mutation fiNfiS CRSCCA CR£CCfiiVT^ 8U SPATULA
. Bulletin of the British Ornithologists' Club. Vol. 73 38 ]953 Let us now examine other species groups as to whether any other instances of a similar nature can be discovered. To the Xth International Ornithological Congress at Uppsala in 19506 I submitted certain evidence of this phenomenon, which may perhaps best be described as reverse mutation, in the genera Garrulus, Pica and Dendrocopos, in support of the hypothesis that such variations in pattern, are to be explained on genetic grounds and have great biological significance. 'Reverse mutation fiNfiS CRSCCA CR£CCfiiVT^ 8U SPATULA \\J CLYPfATA. v (buffiBuS). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Taylor, Nancy M. Oxford : Clarendon Press
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