Ronald Campbell Macfie (1867–1931) was a Scottish medical doctor, poet and science writer specialising in eugenics and evolution.
[1][2] Macfie was a critic of Darwinism and developed his own non-Darwinian evolution theory which was a form of neovitalism.
Among his works are "Man’s Record in the Rocks" (My Magazine, May 1921) The Art of Keeping Well Cassell & Co. 1918/The Vegetarian Society and Evolutionary Consequences of War (cited below).
Campbell Macfie suggested that male war deaths (during World War I) would create a surplus of fertile women, thus reducing the overall birthrate whilst the surviving men would select partners from a wide range of 'surplus' females according to eugenically (sexually) attractive characteristics.
He averred that:[4] Nature has wisely arranged that men should be attracted (to women) by characteristics that imply a superior capacity for motherhood... (thus)...every war will do something to set up evolutionary tendencies opposite to its own, brutal, truculent, anti-social spirit.