Regrowth of an amputated extra thumb.

Thanks RLT for his letter. CD took much trouble over his two cases [regrowth of amputated supernumerary digits, in Variation] but the evidence was shaky.

RLT’s two articles in Spectator [4 Mar and 25 Mar 1876] greatly honour CD.

Tait has made a good point about "Survival of the Fittest".

Dr Rudinger’s extensive inquiries show that all eminent German surgeons are unanimous about non-growth of extra digit after amputation.

J. Kollmann has written regretting CD has given up atavism and extra digits [in 2d ed. of Variation]; gives new evidence of a rudimentary sixth digit in batrachians.

Cat born tailless as a consequence of a spina bifida.

Regrowth of amputated digits is a capacity possessed by the new-born but rapidly lost.