The year 1866 was the first year Alfred Russel Wallace showed definite signs of breaking with Darwin over the limits of natural selection. Attention is drawn to a July 1866 exchange of letters between the two, and how this foreshadowed what followed.
Biodiversity | Ecology and Evolutionary Biology | Evolution | Life Sciences
Smith, Charles H., "Alfred Russel Wallace Notes 27. When Wallace Broke with Darwin." (2023). Faculty/Staff Personal Papers. Paper 334.