On the variety of species definitions prevalent among naturalists.
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On the variety of species definitions prevalent among naturalists.
Notes on the comparative rarity of intermediate forms between species, and the varying relationships those forms may have to one or both species between which they are intermediate.
His experience confirms CD’s view that some species and even some genera of Brachiopoda are consistently more variable than others, and that such variable forms are variable in all localities and at all periods. Similarly a species that shows a lack of variability does so at all points in time and space. Discusses the causes of variability. [See Natural selection, p. 106.]
Thanks her for kindness. Announces, "We have now half-a-dozen Boys" [Charles Waring Darwin, born 6 Dec].