Pleased that Bentham is cautious about Naudin's view of reversion. Darwin can show experimentally that crossing of races and species tends to bring back ancient characters. Suggests Gärtner's Bastarderzeugung  be translated and that Oliver review Scott's Primula paper [J. Linn. Soc. Lond. (Bot.) 8 (1865): 78–126] for a future issue of Natural History Review. Is working on Variation.
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