Note 5 — Chapter I
Reading edition
Zoonomia, Vol. II, p. 247, third edition, 1801. Darwin is here adopting David Hume’s conjecture, which is worked out in some detail in the Zoonomia, the conclusion being that probably “one and the same kind of living filaments is and has been the cause of all organic life” (p. 244). He attributed evolution to internal forces impressed on living matter by the Creator.