Mr. Marshall (or Martial)
Surgeon on an English whaling vessel whom CD met in 1834 during the Beagle voyage.
Sources
Correspondence vol. 3, letter to Henry Denny, 3 June [1844]
Correspondence vol. 13, letter to Henry Denny, 17 January [1865].
Bibliography
Correspondence: The correspondence of Charles Darwin. Edited by Frederick Burkhardt et al. 29 vols to date. Cambridge: Cambridge University Press. 1985–.
letter
