Whether or not there should be movement of particles according to Tyndall's theory of glacial action ["Observations on glaciers", Not. Proc. R. Inst. G. B. 2: 54–8, 441–3]. Darwin subscribes to H. C. Sorby's view of gneiss [Edinburgh New Philos. J. 55 (1853): 137–50]. Seed-salting. Pigeons. Significant differences in skeletons of domesticated rabbits.
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