Priority dispute
- Letter 2337 — Wallace, A. R. to Hooker, J. D., 6 Oct 1858
- Letter 2295 — Darwin, C. R. to Lyell, Charles, 26 [June 1858]
- Letter 2285 — Darwin, C. R. to Lyell, Charles, 18 [June 1858]
- Letter 2294 — Darwin, C. R. to Lyell, Charles, [25 June 1858]
- Letter 2295 — Darwin, C. R. to Lyell, Charles, 26 [June 1858]
- Letter 2299 — Hooker, J. D. & Lyell, Charles to Linnean Society, 30 June 1858
- Letter 2306 — Darwin, C. R. to Hooker, J. D., 13 [July 1858]
Disagreement and respect
- Letter 2525 — Darwin, C. R. to Sedgwick, Adam, 11 Nov 1859
- Letter 2548 — Sedgwick, Adam to Darwin, C. R., 24 Nov 1859
- Letter 2555 — Darwin, C. R. to Sedgwick, Adam, 26 Nov [1859]
- Letter 6024 — Wallace, A. R. to Darwin, C. R., 19 Mar 1868
- Letter 6033 — Darwin, C. R. to Wallace, A. R., [21 Mar 1868]
- Letter 6045 — Wallace, A. R. to Darwin, C. R., 24 Mar [1868]
- Letter 6058 — Darwin, C. R. to Wallace, A. R., 27 Mar [1868]
- Letter 6095 — Darwin, C. R. to Wallace, A. R., 6 Apr [1868]
- Letter 6104 — Wallace, A. R. to Darwin, C. R., 8 [Apr] 1868
Darwin and Owen
- Letter 2526 — Owen, Richard to Darwin, C. R., 12 Nov 1859
- Letter 2580 — Darwin, C. R. to Owen, Richard, 13 Dec [1859]
- Letter 2575 — Darwin, C. R. to Lyell, Charles, [10 Dec 1859]
- Letter 2767 — Darwin, C. R. to Gray, Asa, 25 Apr [1860]
Misunderstandings concerning natural selection
The conduct of debate
Natural selection and humans